J/MNRAS/458/4530 Chandra Galactic Bulge Survey (Wevers+, 2016)
The Chandra Galactic Bulge Survey:
optical catalogue and point-source counterparts to X-ray sources.
Wevers T., Hodgkin S.T., Jonker P.G., Bassa C., Nelemans G.,
van Grunsven T., Gonzalez-Solares E.A., Torres M.A.P., Heinke C.,
Steeghs D., Maccarone T.J., Britt C., Hynes R.I., Johnson C., Wu J.
<Mon. Not. R. Astron. Soc. 458, 4530 (2016)>
=2016MNRAS.458.4530W 2016MNRAS.458.4530W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; X-ray sources ; Milky Way ; Photometry, SDSS ;
Photometry, H-alpha
Keywords: catalogues - optical: general - surveys - X-rays: binaries -
Galaxy: bulge
Abstract:
As part of the Chandra Galactic Bulge Survey (GBS), we present a
catalogue of optical sources in the GBS footprint. This consists of
two regions centered at Galactic latitude b=1.5° above
and below the Galactic Centre, spanning (lxb)=(6°x1°).
The catalogue consists of 2 or more epochs of observations for each
line of sight in r', i' and Hα filters. The catalogue is
complete down to r'=20.2 and i'=19.2mag; the mean 5σ depth is
r'=22.5 and i'=21.1mag. The mean root-mean-square residuals of the
astrometric solutions is 0.04-arcsec. We cross-correlate this optical
catalogue with the 1640 unique X-ray sources detected in Chandra
observations of the GBS area, and nd candidate optical counterparts to
1480 X-ray sources. We use a false alarm probability analysis to
estimate the contamination by interlopers, and expect ∼10 0 per cent of
optical counterparts to be chance alignments. To determine the most
likely counterpart for each X-ray source, we compute the likelihood
ratio for all optical sources within the 4σ X-ray error circle.
This analysis yields 1480 potential counterparts (∼90 per cent of the
sample). 584 counterparts have saturated photometry (r'≤17, i'≤16),
indicating these objects are likely foreground sources and the real
counterparts. 171 candidate counterparts are detected only in the i'
-band. These sources are good qLMXB and CV candidates as they are
X-ray bright and likely located in the Bulge.
Description:
Each image fits file (pobjXXX.fits) has 8 extensions, each
corresponding to one of the 8 CCDs in the mosaic instrument. From
these images, two data products are created: the single-filter object
catalogues, containing the positions, fluxes etc. of all sources on
the respective detectors. These single-filter catalogues are then
combined to create merged 3-filter catalogues, where pointers are
incorporated to point back to the original single-filter catalogue
positions.
The file 'mosaicobs.dat' gives an overview of which field corresponds
to which catalogue file.
Below is a description of the entries in both sets of catalogues.
Indicated between square brackets are the units (if applicable).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 166 64 List of the pointing centre and the seeing
towards each field in the r'-band
mosaicob.dat 139 535 Overview of which field corresponds to which
catalogue file
images.dat 444 19 List of fits images for fields other than
those in table1
mercat1.sam 613 1000 Sample of merged catalogues with rgiHalpha data
(among 3,144,075 stars)
mercat2.sam 485 1000 Sample of merged catalogues with riHalpha data
(among 38,387,310 stars)
conserv.dat 96 1287 Most likely optical counterparts of the most
conservative sample determined from the
likelihood ratio method (table 7 of the paper)
nohalpha.dat 96 1345 Most likely optical counterparts determined
with only r' and i' detections from the
likelihood ratio method (table 7 of the paper)
onlyi.dat 96 1480 Most likely optical counterparts determined
with only i' detections from the likelihood
ratio method (table 7 of the paper)
cat1/* . 3064 Single filter catalogues
cat2/* . 16 Single filter catalogues for fields 277 and 278
mercat1/* . 96 Merged catalogues with rgiHalpha data
mercat2/* . 928 Merged catalogues with riHalpha data
fits/* . 513 Fits files of catalogs
img/* . 763 Fits images
--------------------------------------------------------------------------------
See also:
J/ApJS/210/18 : X-ray survey of the Galactic Bulge (CXOGBS) (Jonker+, 2014)
J/ApJS/214/10 : Optical counterparts of Chandra GBS sources (Britt+, 2014)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Field Field name (S01-S32, N01-N32)
5- 12 F8.5 deg GLON [] Galactic longitude of center in the r'-band
14- 21 F8.5 deg GLAT Galactic latitude of center in the r'-band
23- 26 F4.2 arcsec Seeing Seeing in the r'-band (1)
28- 37 F10.4 d Obs.Date Observation date (MJD) (2)
40-166 A127 --- Id Names of optical images and catalogs files
for the field (3)
--------------------------------------------------------------------------------
Note (1): The median seeing during the observing run is 1.06 arcsec.
Note (2): The observing date is the modified Julian date (MJD) of the
r'-band observation, which is the middle exposure of the (i', r', Hα)
observing sequence for each field.
Note (3): The names are objNNNN.
Fits images are named pobjNNNN.fits and are in subdirectory img.
Fits catalogs are named npobjNNNN_cat.fits and npobjNNNNcatmercat.fits
and are in subdirectory fits.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: mosaicob.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- ID Identification (objNNN)
12- 32 A21 --- Obs.Date Observation date
36- 41 F6.2 s ExpTime Exposure time
43- 44 A2 --- Band [gri Ha] Observed band
46- 50 F5.3 arcsec Seeing Seeing
52- 66 A15 --- Name Name of the GBS field with filter
(GBS[SN]NN[griH], GBS[SN]NN[griH]_off,
GBS[SN]NN[griH]_short)
70- 81 A12 --- Img Name of the fits image in subdirectory img
83- 86 A4 ---- Dir1 Name of the subdirectory with ascii single
filter catalogues (1)
88-105 A18 --- FileName1 Name of the fits file with single filter
catalogues in subdirectory fits
107-113 A7 --- Dir2 Name of the subdirectory with ascii merged
catalogues (2)
115-139 A25 --- FileName2 Name of the fits file with merged catalogues
in subdirectory fits
--------------------------------------------------------------------------------
Note (1): Files named nIDcatN.dat, N=1-8, i.e.
npobj952cat1.dat to npobj952cat8.dat for ID=obj952
Note (2): Files named nIDcatmercat_N.dat, N=1-8, i.e.
npobj217catmercat_1.dat to npobj217catmercat_8.dat for ID=obj217
--------------------------------------------------------------------------------
Byte-by-byte Description of file: images.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Field Field name
17- 28 A12 --- img1 Name of fits image in subdirectory img
30- 41 A12 --- img2 Name of fits image in subdirectory img
43- 54 A12 --- img3 Name of fits image in subdirectory img
56- 67 A12 --- img4 Name of fits image in subdirectory img
69- 80 A12 --- img5 Name of fits image in subdirectory img
82- 93 A12 --- img6 Name of fits image in subdirectory img
95-106 A12 --- img7 Name of fits image in subdirectory img
108-119 A12 --- img8 Name of fits image in subdirectory img
121-132 A12 --- img9 Name of fits image in subdirectory img
134-145 A12 --- img10 Name of fits image in subdirectory img
147-158 A12 --- img11 Name of fits image in subdirectory img
160-171 A12 --- img12 Name of fits image in subdirectory img
173-184 A12 --- img13 Name of fits image in subdirectory img
186-197 A12 --- img14 Name of fits image in subdirectory img
199-210 A12 --- img15 Name of fits image in subdirectory img
212-223 A12 --- img16 Name of fits image in subdirectory img
225-236 A12 --- img17 Name of fits image in subdirectory img
238-249 A12 --- img18 Name of fits image in subdirectory img
251-262 A12 --- img19 Name of fits image in subdirectory img
264-275 A12 --- img20 Name of fits image in subdirectory img
277-288 A12 --- img21 Name of fits image in subdirectory img
290-301 A12 --- img22 Name of fits image in subdirectory img
303-314 A12 --- img23 Name of fits image in subdirectory img
316-327 A12 --- img24 Name of fits image in subdirectory img
329-340 A12 --- img25 Name of fits image in subdirectory img
342-353 A12 --- img26 Name of fits image in subdirectory img
355-366 A12 --- img27 Name of fits image in subdirectory img
368-379 A12 --- img28 Name of fits image in subdirectory img
381-392 A12 --- img29 Name of fits image in subdirectory img
394-405 A12 --- img30 Name of fits image in subdirectory img
407-418 A12 --- img31 Name of fits image in subdirectory img
420-431 A12 --- img32 Name of fits image in subdirectory img
433-444 A12 --- img33 Name of fits image in subdirectory img
--------------------------------------------------------------------------------
Byte-by-byte Description of file: mercat1.sam
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Right ascension (J2000)
12- 21 F10.6 deg DEdeg Declination (J2000)
23- 31 F9.3 --- Xi Intensity-weighted isophotal
centre-of-gravity in X (Xi)
33- 41 F9.3 --- Xn Intensity-weighted isophotal
centre-of-gravity in Y (Xn)
43- 51 F9.6 mag rApermag1 ?=0 r-band Vega magnitude determined with an
aperture radius of 1/2*core radius
(rApermag1) (1)
53- 61 F9.6 mag e_rApermag1 ?=0 rms uncertainty on rApermag1
(rApermag1_err)
63- 71 F9.6 mag rApermag2 ?=0 r-band Vega magnitude determined with an
aperture radius of 1*core radius
(rApermag2) (1)
73- 82 F10.6 mag e_rApermag2 ?=0 rms uncertainty on rApermag2
(rApermag2_err)
84- 92 F9.6 mag rApermag3 ?=0 r-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(rApermag3) (1)
94-104 F11.6 mag e_rApermag3 ?=0 rms uncertainty on rApermag3
(rApermag3_err)
106-114 F9.6 mag rApermag4 ?=0 r-band Vega magnitude determined with an
aperture radius of 2*core radius
(rApermag4) (1)
116-126 F11.6 mag e_rApermag4 ?=0 rms uncertainty on rApermag4
(rApermag4_err)
128-136 F9.6 mag rApermag5 ?=0 r-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(rApermag5) (1)
138-148 F11.6 mag e_rApermag5 ?=0 rms uncertainty on rApermag5
(rApermag5_err)
150-151 I2 --- rClass [-9/1] Morphological classification based on
the shape of the PSF for r-band (rClass) (G1)
153-161 F9.6 mag rTiltmag ?=0 r-band Vega magnitude (rTiltmag)
163-173 F11.6 mag e_rTiltmag ?=0 rms uncertainty on rTiltmag (rTiltmag_err)
175-179 I5 --- rPointer ?=0 ID number in the r-band single-filter
catalog (rPointer) (2)
181-189 F9.6 mag gApermag1 ?=0 r-band Vega magnitude determined with an
aperture radius 0f 1/2*core radius
(gApermag1) (1)
191-199 F9.6 mag e_gApermag1 ?=0 rms uncertainty on gApermag1
(gApermag1_err)
201-209 F9.6 mag gApermag2 ?=0 g-band Vega magnitude determined with an
aperture radius of 1*core radius
(gApermag2) (1)
211-220 F10.6 mag e_gApermag2 ?=0 rms uncertainty on gApermag2
(gApermag2_err)
222-230 F9.6 mag gApermag3 ?=0 g-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(gApermag3) (1)
232-241 F10.6 mag e_gApermag3 ?=0 rms uncertainty on gApermag3
(gApermag3_err)
243-251 F9.6 mag gApermag4 ?=0 g-band Vega magnitude determined with an
aperture radius of 2*core radius
(gApermag4) (1)
253-263 F11.6 mag e_gApermag4 ?=0 rms uncertainty on gApermag4
(gApermag4_err)
265-273 F9.6 mag gApermag5 ?=0 g-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(gApermag5) (1)
275-285 F11.6 mag e_gApermag5 ?=0 rms uncertainty on gApermag5
(gApermag5_err)
287-288 I2 --- gClass [-9/1] Morphological classification based
on the shape of the PSF for g-band
(gClass) (G1)
290-298 F9.6 mag gTiltmag ?=0 g-band magnitude (gTiltmag)
300-310 F11.6 mag e_gTiltmag ?=0 rms uncertainty on gTiltmag (gTiltmag_err)
312-316 I5 --- gPointer ?=0 ID number in the g-band single-filter
catalog (gPointer) (2)
318-326 F9.6 mag iApermag1 ?=0 i-band Vega magnitude determined with an
aperture radius 0f 1/2*core radius
(iApermag1) (1)
328-337 F10.6 mag e_iApermag1 ?=0 rms uncertainty on iApermag1
(iApermag1_err)
339-347 F9.6 mag iApermag2 ?=0 i-band Vega magnitude determined with an
aperture radius of 1*core radius
(iApermag2) (1)
349-358 F10.6 mag e_iApermag2 ?=0 rms uncertainty on iApermag2
(iApermag2_err)
360-368 F9.6 mag iApermag3 ?=0 i-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(iApermag3) (1)
370-380 F11.6 mag e_iApermag3 ?=0 rms uncertainty on iApermag3
(iApermag3_err)
382-390 F9.6 mag iApermag4 ?=0 i-band Vega magnitude determined with an
aperture radius of 2*core radius
(iApermag4) (1)
392-403 F12.6 mag e_iApermag4 ?=0 rms uncertainty on iApermag4
(iApermag4_err)
405-413 F9.6 mag iApermag5 ?=0 i-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(iApermag5) (1)
415-426 F12.6 mag e_iApermag5 ?=0 rms uncertainty on iApermag5
(iApermag5_err)
428-429 I2 --- iClass [-9/1] Morphological classification based on
the shape of the PSF for i-band (iClass) (G1)
431-439 F9.6 mag iTiltmag ?=0 i-band magnitude (iTiltmag)
441-451 F11.6 mag e_iTiltmag ?=0 rms uncertainty on iTiltmag (iTiltmag_err)
453-457 I5 --- iPointer ?=0 ID number in the i-band single-filter
catalog (iPointer) (2)
459-467 F9.6 mag HaApermag1 ?=0 Halpha-band Vega magnitude determined with
an aperture radius 0f 1/2*core radius
(hApermag1) (1)
469-476 F8.6 mag e_HaApermag1 ?=0 rms uncertainty on HApermag1
(hApermag1_err)
478-486 F9.6 mag HaApermag2 ?=0 Halpha-band Vega magnitude determined with
an aperture radius of 1*core radius
(hApermag2) (1)
488-497 F10.6 mag e_HaApermag2 ?=0 rms uncertainty on HApermag2
(hApermag2_err))
499-507 F9.6 mag HaApermag3 ?=0 Halpha-band Vega magnitude determined with
an aperture radius of sqrt(2)*core radius
(hApermag3) (1)
509-519 F11.6 mag e_HaApermag3 ?=0 rms uncertainty on HApermag3
(hApermag3_err)
521-529 F9.6 mag HaApermag4 ?=0 Halpha-band Vega magnitude determined with
an aperture radius of 2*core radius
(hApermag4) (1)
531-541 F11.6 mag e_HaApermag4 ?=0 rms uncertainty on HApermag4 (hApermag4_err)
543-551 F9.6 mag HaApermag5 ?=0 Halpha-band Vega magnitude determined with
an aperture radius of 2sqrt(2)*core radius
(hApermag5) (1)
553-563 F11.6 mag e_HaApermag5 ?=0 rms uncertainty on hApermag5
(hApermag5_err))
565-566 I2 --- HaClass [-9/1] Morphological classification based on
the shape of the PSF for Hα-band
(hClass) (G1)
568-576 F9.6 mag HaTiltmag ?=0 Halpha magnitude (hTiltmag)
578-588 F11.6 mag e_HaTiltmag ?=0 rms uncertainty on HTiltmag (hTiltmag_err)
590-594 I5 --- HaPointer ?=0 ID number in the Halpha-band single-filter
catalog (hPointer) (2)
596-603 F8.6 rad RArd Right ascension of object on the sky in
radian (J2000) (RA) (3)
605-613 F9.6 rad DErd Declination of object on the sky in
radian (J2000) (DEC) (3)
--------------------------------------------------------------------------------
Note (1): The core radius is equal to the median seeing as determined from the
PSF of the stars on the respective detectors. The above are a series of
different radii soft-edged apertures designed to adequately sample the
curve-of-growth of the majority of images and to provide fixed-sized aperture
fluxes for all images. An rcore-radius aperture contains roughly 2/3 of the
total flux of stellar images.
The aperture fluxes are sky-corrected integrals (summations) with a soft-edge
(i.e. prorata flux division for boundary pixels). However, for overlapping
images they are more subtle than this since they are in practice
simultaneously fitted top-hat functions, to minimise the effects of crowding.
Images external to the blend are also flagged and not included in the large
radius summations.
Note (2): Pointer is an integer, and can be used to find the object in the
single-band catalogues. This corresponds to the entry 'Number' in the
single-filter catalogues. So rPointer points to the r-band catalogue of a
given field, iPointer to the i-band catalogue etc.
Note (3): Sky coordinates of the source in the r' filter image. The order in
which coordinates are chosen here is hierarchical: first r', if that is not
available i', else Halpha.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: mercat2.sam
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Right ascension (J2000)
12- 21 F10.6 deg DEdeg Declination (J2000)
23- 31 F9.3 --- Xi Intensity-weighted isophotal
centre-of-gravity in X (Xi)
33- 41 F9.3 --- Xn Intensity-weighted isophotal
centre-of-gravity in Y (Xn)
43- 51 F9.6 mag rApermag1 ?=0 r-band Vega magnitude determined with an
aperture radius of 1/2*core radius
(rApermag1) (1)
53- 63 F11.6 mag e_rApermag1 ?=0 rms uncertainty on rApermag1
(rApermag1_err)
65- 73 F9.6 mag rApermag2 ?=0 r-band Vega magnitude determined with an
aperture radius of 1*core radius
(rApermag2) (1)
75- 85 F11.6 mag e_rApermag2 ?=0 rms uncertainty on rApermag2
(rApermag2_err)
87- 95 F9.6 mag rApermag3 ?=0 r-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(rApermag3) (1)
97-107 F11.6 mag e_rApermag3 ?=0 rms uncertainty on rApermag3
(rApermag3_err)
109-117 F9.6 mag rApermag4 ?=0 r-band Vega magnitude determined with an
aperture radius of 2*core radius
(rApermag4) (1)
119-129 F11.6 mag e_rApermag4 ?=0 rms uncertainty on rApermag4 (rApermag4_err)
131-139 F9.6 mag rApermag5 ?=0 r-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(rApermag5) (1)
141-151 F11.6 mag e_rApermag5 ?=0 rms uncertainty on rApermag5
(rApermag5_err)
153-154 I2 --- rClass [-9/1] Morphological classification based on
the shape of the PSF for r-band
(rClass) (G1)
156-164 F9.6 mag rTiltmag ?=0 r-band Vega magnitude (rTiltmag)
166-176 F11.6 mag e_rTiltmag ?=0 rms uncertainty on rTiltmag
(rTiltmag_err)
178-182 I5 --- rPointer ?=0 ID number in the r-band single-filter
catalog (rPointer) (2)
184-192 F9.6 mag iApermag1 ?=0 i-band Vega magnitude determined with an
aperture radius 0f 1/2*core radius
(iApermag1) (1)
194-204 F11.6 mag e_iApermag1 ?=0 rms uncertainty on iApermag1
(iApermag1_err)
206-214 F9.6 mag iApermag2 ?=0 i-band Vega magnitude determined with an
aperture radius of 1*core radius
(iApermag2) (1)
216-226 F11.6 mag e_iApermag2 ?=0 rms uncertainty on iApermag2
(iApermag2_err)
228-236 F9.6 mag iApermag3 ?=0 i-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(iApermag3) (1)
238-248 F11.6 mag e_iApermag3 ?=0 rms uncertainty on iApermag3
(iApermag3_err)
250-258 F9.6 mag iApermag4 ?=0 i-band Vega magnitude determined with an
aperture radius of 2*core radius
(iApermag4) (1)
260-270 F11.6 mag e_iApermag4 ?=0 rms uncertainty on iApermag4
(iApermag4_err)
272-280 F9.6 mag iApermag5 ?=0 i-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(iApermag5) (1)
282-292 F11.6 mag e_iApermag5 ?=0 rms uncertainty on iApermag5
(iApermag5_err)
294-295 I2 --- iClass [-9/1] Morphological classification based
on the shape of the PSF for i-band
(iClass) (G1)
297-305 F9.6 mag iTiltmag ?=0 g-band magnitude (iTiltmag)
307-317 F11.6 mag e_iTiltmag ?=0 rms uncertainty on iTiltmag
(iTiltmag_err)
319-323 I5 --- iPointer ?=0 ID number in the i-band single-filter
catalog (iPointer) (2)
325-333 F9.6 mag HaApermag1 ?=0 Halpha-band Vega magnitude determined
with an aperture radius 0f 1/2*core radius
(hApermag1) (1)
335-345 F11.6 mag e_HaApermag1 ?=0 rms uncertainty on HApermag1
(hApermag1_err)
347-355 F9.6 mag HaApermag2 ?=0 Halpha-band Vega magnitude determined
with an aperture radius of 1*core radius
(hApermag2) (1)
357-367 F11.6 mag e_HaApermag2 ?=0 rms uncertainty on HApermag2
(hApermag2_err)
369-377 F9.6 mag HaApermag3 ?=0 Halpha-band Vega magnitude determined
with an aperture radius of sqrt(2)*core
radius (hApermag3) (1)
379-389 F11.6 mag e_HaApermag3 ?=0 rms uncertainty on HApermag3
(hApermag3_err)
391-399 F9.6 mag HaApermag4 ?=0 Halpha-band Vega magnitude determined
with an aperture radius of 2*core radius
(hApermag4) (1)
401-412 F12.6 mag e_HaApermag4 ?=0 rms uncertainty on HApermag4
(hApermag4_err)
414-422 F9.6 mag HaApermag5 ?=0 Halpha-band Vega magnitude determined
with an aperture radius of
2sqrt(2)*core radius (hApermag5) (1)
424-435 F12.6 mag e_HaApermag5 ?=0 rms uncertainty on HApermag5
(hApermag5_err)
437-438 I2 --- HClass [-9/1] Morphological classification based on
the shape of the PSF for Halpha-band
(hClass) (G1)
440-448 F9.6 mag HaTiltmag ?=0 Halpha-band magnitude (hTiltmag)
450-460 F11.6 mag e_HaTiltmag ?=0 rms uncertainty on HTiltmag
(hTiltmag_err)
462-466 I5 --- HaPointer ?=0 ID number in the Halpha-band
single-filter catalog (hPointer) (2)
468-475 F8.6 rad RArd Right ascension of object on the sky in
radian (J2000) (RA) (3)
477-485 F9.6 rad DErd Declination of object on the sky in
radian (J2000) (DEC) (3)
--------------------------------------------------------------------------------
Note (1): The core radius is equal to the median seeing as determined from the
PSF of the stars on the respective detectors. The above are a series of
different radii soft-edged apertures designed to adequately sample the
curve-of-growth of the majority of images and to provide fixed-sized aperture
fluxes for all images. An rcore-radius aperture contains roughly 2/3 of the
total flux of stellar images.
The aperture fluxes are sky-corrected integrals (summations) with a soft-edge
(i.e. prorata flux division for boundary pixels). However, for overlapping
images they are more subtle than this since they are in practice
simultaneously fitted top-hat functions, to minimise the effects of crowding.
Images external to the blend are also flagged and not included in the large
radius summations.
Note (2): Pointer is an integer, and can be used to find the object in the
single-band catalogues. This corresponds to the entry 'Number' in the
single-filter catalogues. So rPointer points to the r-band catalogue of a
given field, iPointer to the i-band catalogue etc.
Note (3): Sky coordinates of the source in the r' filter image. The order in
which coordinates are chosen here is hierarchical: first r', if that is not
available i', else Halpha.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: conserv.dat nohalpha.dat onlyi.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Name Identification (CXNNNN, CXBNNN)
8- 17 F10.6 deg RAdeg Optical right ascension (J2000)
19- 28 F10.6 deg DEdeg Optical declination (J2000)
30- 34 F5.2 mag r'mag r' magnitude (Vega)
36- 39 F4.2 mag e_r'mag rms uncertainty on r'mag
41- 45 F5.2 mag i'mag i' magnitude (Vega)
47- 50 F4.2 mag e_i'mag rms uncertainty on i'mag
52- 56 F5.2 mag Hamag Halpha magnitude (Vega)
58- 61 F4.2 mag e_Hamag rms uncertainty on Hamag
63- 67 F5.2 arcsec R4sigma 4σ error circle radius
69- 72 F4.2 --- Offset Offset in R4sigma units
74- 81 F8.2 --- L Likelihood ratio for objects in the 4sigma
error circle
83- 87 F5.2 --- Num Number of unique optical sources within each
error circle (1)
89- 90 I2 --- Fr' [-9/1] r' morphological flag associated with
the detection (G1)
92- 93 I2 --- Fi' [-9/1] i' morphological flag associated with
the detection (G1)
95- 96 I2 --- FHa [-9/1] Halpha morphological flag associated
with the detection (G1)
--------------------------------------------------------------------------------
Note (1): If the X-ray source is present on multiple fields, we quote the
average of all fields (which explains the presence of non-integer numbers
in this column).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cat1/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 7 I6 --- Seq Running number for ease of reference, in
strict order of image detections (Number)
9- 20 E12.6 ct Fiso Standard definition of summed flux within
detection isophote (Isophotal_flux) (1)
22- 33 E12.6 ct Ftot Aperture-corrected flux, to be used in the
sense that corrected photometry =
2.5*log10(flux) + apcor (Total_flux)
35- 46 E12.6 ct Fcore Flux within an aperture with radius equal to
the median seeing in the image (Core_flux)
48- 59 E12.6 pix Xpos Intensity-weighted isophotal centre-of-gravity
in X (X_coordinate)
61- 72 E12.6 pix Ypos Intensity-weighted isophotal centre-of-gravity
in Y (Y_coordinate)
74- 84 F11.6 pix rms RMS of axes of ellipse fit (Gaussian_sigma)
86- 93 F8.6 --- Ell Equivalence between the detection isophote and
a generalised elliptical Gaussian
(Ellipticity)
95-104 F10.6 deg PA Position angle (Position_angle)
106-117 E12.6 ct Peakh Peak value of flux within aperture radius
(Peak_height)
119-130 E12.6 pix Are1prof Number of pixels above a series of threshold
levels relative to local sky
(Areal1profile) (2)
132-142 F11.6 pix Are2prof Number of pixels above a series of threshold
levels relative to local sky
(Areal2profile) (2)
144-154 F11.6 pix Are3prof Number of pixels above a series of threshold
levels relative to local sky
(Areal3profile) (2)
156-166 F11.6 pix Are4prof Number of pixels above a series of threshold
levels relative to local sky
(Areal4profile) (2)
168-178 F11.6 pix Are5prof Number of pixels above a series of threshold
levels relative to local sky
(Areal5profile) (2)
180-190 F11.6 pix Are6prof Number of pixels above a series of threshold
levels relative to local sky
(Areal6profile) (2)
192-202 F11.6 pix Are7prof Number of pixels above a series of threshold
levels relative to local sky
(Areal7profile) (2)
204-215 F12.6 pix Are8prof Number of pixels above a series of threshold
levels relative to local sky
(Areal8profile) (2)
217-228 E12.6 ct Fcore1 Flux at 1/2*rcore radius (Core1_flux) (3)
230-241 E12.6 ct Fcore2 Flux at rcore radius (Core2_flux) (3)
243-254 E12.6 ct Fcore3 Flux at sqrt(2)*rcore radius (Core3_flux) (3)
256-267 E12.6 ct Fcore4 Flux at 2*rcore radius (Core4_flux) (3)
269-277 F9.6 rad RArd Right ascension of object on the sky in
radian (J2000) (RA)
279-287 F9.6 rad DErd Declination of object on the sky in
radian (J2000) (DEC)
291-292 I2 --- Class [-9/1] Morphological classification code
(Classification) (G1)
PB npobj277cat1.dat
npobj278cat1.dat
294-304 F11.6 --- Stat An equivalent N(0,1) measure of how
stellar-like an image is (Statistic) (5)
306-317 E12.6 ct Fcore5 Flux at 2sqrt(2)*core radius (Core5_flux) (3)
319-326 F8.2 ct Skylev Median sky brightness (Sky_lev)
328-338 F11.6 ct Skyrms Pixel noise at sky level (Sky_rms)
340-348 F9.6 ct Badpix Number of bad pixels within aperture of radius
"rcore" - note this can be fractional due to
soft-edged apertures (Bad_pixels)
350-358 F9.4 --- Avconf Average confidence level within the default
rcore aperture useful for spotting spurious
outliers in various parameter selection
spaces (Av_conf)
--------------------------------------------------------------------------------
Note (1): apart from detection filter is used to define pixel connectivity and
hence which pixels to include. This helps to reduce edge effects for all
isophotally derived parameters.
Note (2): Levels are set at T, 2T, 4T, 8T . . . 128T where T is the threshold.
These can be thought of as a sort of poor man's radial profile. Note that for
now deblended, i.e. overlapping images, only the first areal profile is
computed and the rest are set to -1 flagging the difficulty of computing
accurate profiles.
Note (3): These are a series of different radii soft-edged apertures designed
to adequately sample the curve-of-growth of the majority of images and to
provide fixed-sized aperture fluxes for all images.
The aperture fluxes are sky-corrected integrals (summations) with a soft-edge
(ie. prorata flux division for boundary pixels). However, for overlapping
images they are more subtle than this since they are in practice
simultaneously fitted top-hat functions, to minimise the effects of crowding.
Images external to the blend are also flagged and not included in the large
radius summations.
Note (5): Used in deriving parameter 61 in a 'necessary but not sufficient'
sense. Derived mainly from the curve-of-growth of flux using the well-defined
stellar locus as a function of magnitude as a benchmark
(see Irwin et al. 1994 SPIE 5493 411 for more details).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cat2/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 7 I6 --- Seq Running number for ease of reference, in
strict order of image detections (Number)
9- 20 E12.6 --- Fiso Standard definition of summed flux within
detection isophote (ADU) (Isophotal_flux) (1)
22- 33 E12.6 pix Xpos Intensity-weighted isophotal
centre-of-gravity in X (X_coordinate)
35- 42 F8.6 pix e_Xpos rms uncertainty on Xpos (Xcoordinateerr)
44- 55 E12.6 pix Ypos Intensity-weighted isophotal
centre-of-gravity in Y (Y_coordinate)
57- 64 F8.6 pix e_Ypos rms uncertainty on Xpos (Ycoordinateerr)
66- 75 F10.6 pix rms RMS of axes of ellipse fit (Gaussian_sigma)
77- 84 F8.6 --- Ell Equivalence between the detection isophote
and a generalised elliptical Gaussian
(Ellipticity)
86- 95 F10.6 deg PA Position angle (Position_angle)
97-108 E12.6 pix Are1prof Number of pixels above a series of threshold
levels relative to local sky
(Areal1profile) (2)
110-120 F11.6 pix Are2prof Number of pixels above a series of threshold
levels relative to local sky
(Areal2profile) (2)
122-132 F11.6 pix Are3prof Number of pixels above a series of threshold
levels relative to local sky
(Areal3profile) (2)
134-144 F11.6 pix Are4prof Number of pixels above a series of threshold
levels relative to local sky
(Areal4profile) (2)
146-156 F11.6 pix Are5prof Number of pixels above a series of threshold
levels relative to local sky
(Areal5profile) (2)
158-168 F11.6 pix Are6prof Number of pixels above a series of threshold
levels relative to local sky
(Areal6profile) (2)
170-180 F11.6 pix Are7prof Number of pixels above a series of threshold
levels relative to local sky
(Areal7profile) (2)
182-190 F9.6 pix Are8prof Number of pixels above a series of threshold
levels relative to local sky
(Areal8profile) (2)
192-203 E12.6 --- Peakh Peak value of flux within aperture radius
(ADU) (Peak_height)
205-211 F7.3 --- e_Peakh rms uncertainty on Peakh (ADU)
(Peakheighterr)
213-224 E12.6 --- Aperflux1 Flux in aperture 1 (ADU) (Aperflux1)
226-232 F7.2 --- e_Aperflux1 rms uncertainty on Aperflux1 (ADU)
(Aperflux1_err)
234-245 E12.6 --- Aperflux2 Flux in aperture 2 (ADU) (Aperflux2)
247-253 F7.2 --- e_Aperflux2 rms uncertainty on Aperflux2 (ADU)
(Aperflux2_err)
255-266 E12.6 --- Aperflux3 Flux in aperture 3 (ADU) (Aperflux3)
268-274 F7.2 --- e_Aperflux3 rms uncertainty on Aperflux3 (ADU)
(Aperflux3_err)
276-287 E12.6 --- Aperflux4 Flux in aperture 4 (ADU) (Aperflux4)
289-295 F7.2 --- e_Aperflux4 rms uncertainty on Aperflux4 (ADU)
(Aperflux4_err)
297-308 E12.6 --- Aperflux5 Flux in aperture 5 (ADU) (Aperflux5)
310-316 F7.2 --- e_Aperflux5 rms uncertainty on Aperflux5 (ADU)
(Aperflux5_err)
318-325 F8.5 pix RPetro Pertrosian radius (Petr_radius)
327-335 F9.6 pix RKron Kron radius (Kron_radius)
337-348 E12.6 pix Rhalf Half-light radius (Half_radius)
350-361 E12.6 --- FPetro Petrosian flux (ADU) (Petr_flux)
363-374 E12.6 --- e_FPetro rms uncertainty on FPetro (ADU)
(Petrfluxerr)
376-387 E12.6 --- FKron Kron flux (ADU) (Kron_flux)
389-400 E12.6 --- e_FKron rms uncertainty on FKron (ADU)
(Kronfluxerr)
402-413 E12.6 --- Fhalf Half-light flux (ADU) (Half_flux)
415-426 E12.6 --- e_Fhalf rms uncertainty on Fhalf (ADU)
(Halffluxerr)
428-436 F9.6 --- ErrBit Error bit flag (Errorbitflag)
438-449 E12.6 --- Skylev Median sky brightness (ADU) (Sky_level)
451-460 F10.6 --- Skyrms Pixel noise at sky level (ADU) (Sky_rms)
462-469 F8.4 --- Avconf Average confidence level within the default
rcore aperture useful for spotting spurious
outliers in various parameter selection
spaces (Av_conf)
471-479 F9.6 rad RArd Right ascension of object on the sky in
radian (J2000) (RA)
481-489 F9.6 rad DErd Declination of object on the sky in
radian (J2000) (DEC)
493-494 I2 --- Class [-9/1] Morphological classification code
(Classification) (G1)
496-505 F10.6 --- Stat An equivalent N(0,1) measure of how
stellar-like an image is (Statistic) (5)
--------------------------------------------------------------------------------
Note (1): apart from detection filter is used to define pixel connectivity and
hence which pixels to include. This helps to reduce edge effects for all
isophotally derived parameters.
Note (2): Levels are set at T, 2T, 4T, 8T . . . 128T where T is the threshold.
These can be thought of as a sort of poor man's radial profile. Note that for
now deblended, i.e. overlapping images, only the first areal profile is
computed and the rest are set to -1 flagging the difficulty of computing
accurate profiles.
Note (5): Used in deriving parameter 61 in a 'necessary but not sufficient'
sense. Derived mainly from the curve-of-growth of flux using the well-defined
stellar locus as a function of magnitude as a benchmark
(see Irwin et al. 1994 SPIE 5493 411 for more details).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: mercat1/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.3 --- Xi Intensity-weighted isophotal
centre-of-gravity in X (Xi)
11- 19 F9.3 --- Xn Intensity-weighted isophotal
centre-of-gravity in Y (Xn)
21- 29 F9.6 mag rApermag1 r-band Vega magnitude determined with an
aperture radius of 1/2*core radius
(rApermag1) (1)
31- 41 F11.6 mag e_rApermag1 rms uncertainty on rApermag1 (rApermag1_err)
43- 51 F9.6 mag rApermag2 r-band Vega magnitude determined with an
aperture radius of 1*core radius
(rApermag2) (1)
53- 63 F11.6 mag e_rApermag2 rms uncertainty on rApermag2 (rApermag2_err)
65- 73 F9.6 mag rApermag3 r-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(rApermag3) (1)
75- 85 F11.6 mag e_rApermag3 rms uncertainty on rApermag3 (rApermag3_err)
87- 95 F9.6 mag rApermag4 r-band Vega magnitude determined with an
aperture radius of 2*core radius
(rApermag4) (1)
97-107 F11.6 mag e_rApermag4 rms uncertainty on rApermag4 (rApermag4_err)
109-117 F9.6 mag rApermag5 r-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(rApermag5) (1)
119-129 F11.6 mag e_rApermag5 rms uncertainty on rApermag5 (rApermag5_err)
133-134 I2 --- rClass [-9/1] Morphological classification based on
the shape of the PSF for r-band (rClass) (G1)
136-144 F9.6 mag rTiltmag r-band Vega magnitude (rTiltmag)
146-156 F11.6 mag e_rTiltmag rms uncertainty on rTiltmag (rTiltmag_err)
158-162 I5 --- rPointer ID number in the r-band single-filter catalog
(rPointer) (2)
164-172 F9.6 mag gApermag1 r-band Vega magnitude determined with an
aperture radius 0f 1/2*core radius
(gApermag1) (1)
174-184 F11.6 mag e_gApermag1 rms uncertainty on gApermag1 (gApermag1_err)
186-194 F9.6 mag gApermag2 g-band Vega magnitude determined with an
aperture radius of 1*core radius
(gApermag2) (1)
196-206 F11.6 mag e_gApermag2 rms uncertainty on gApermag2 (gApermag2_err)
208-216 F9.6 mag gApermag3 g-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(gApermag3) (1)
218-228 F11.6 mag e_gApermag3 rms uncertainty on gApermag3 (gApermag3_err)
230-238 F9.6 mag gApermag4 g-band Vega magnitude determined with an
aperture radius of 2*core radius
(gApermag4) (1)
240-250 F11.6 mag e_gApermag4 rms uncertainty on gApermag4 (gApermag4_err)
252-260 F9.6 mag gApermag5 g-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(gApermag5) (1)
262-272 F11.6 mag e_gApermag5 rms uncertainty on gApermag5 (gApermag5_err)
276-277 I2 --- gClass [-9/1] Morphological classification based
on the shape of the PSF for g-band
(gClass) (G1)
279-287 F9.6 mag gTiltmag g-band magnitude (gTiltmag)
289-299 F11.6 mag e_gTiltmag rms uncertainty on gTiltmag (gTiltmag_err)
301-305 I5 --- gPointer ID number in the g-band single-filter catalog
(gPointer) (2)
307-315 F9.6 mag iApermag1 i-band Vega magnitude determined with an
aperture radius 0f 1/2*core radius
(iApermag1) (1)
317-327 F11.6 mag e_iApermag1 rms uncertainty on iApermag1 (iApermag1_err)
329-337 F9.6 mag iApermag2 i-band Vega magnitude determined with an
aperture radius of 1*core radius
(iApermag2) (1)
339-349 F11.6 mag e_iApermag2 rms uncertainty on iApermag2 (iApermag2_err)
351-359 F9.6 mag iApermag3 i-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(iApermag3) (1)
361-371 F11.6 mag e_iApermag3 rms uncertainty on iApermag3 (iApermag3_err)
373-381 F9.6 mag iApermag4 i-band Vega magnitude determined with an
aperture radius of 2*core radius
(iApermag4) (1)
383-394 F12.6 mag e_iApermag4 rms uncertainty on iApermag4 (iApermag4_err)
396-404 F9.6 mag iApermag5 i-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(iApermag5) (1)
406-417 F12.6 mag e_iApermag5 rms uncertainty on iApermag5 (iApermag5_err)
421-422 I2 --- iClass [-9/1] Morphological classification based on
the shape of the PSF for i-band (iClass) (G1)
424-432 F9.6 mag iTiltmag i-band magnitude (iTiltmag)
434-444 F11.6 mag e_iTiltmag rms uncertainty on iTiltmag (iTiltmag_err)
446-450 I5 --- iPointer ID number in the i-band single-filter catalog
(iPointer) (2)
452-460 F9.6 mag HaApermag1 Halpha-band Vega magnitude determined with
an aperture radius 0f 1/2*core radius
(hApermag1) (1)
462-472 F11.6 mag e_HaApermag1 rms uncertainty on HApermag1 (hApermag1_err)
474-482 F9.6 mag HaApermag2 Halpha-band Vega magnitude determined with
an aperture radius of 1*core radius
(hApermag2) (1)
484-494 F11.6 mag e_HaApermag2 rms uncertainty on HApermag2 (hApermag2_err))
496-504 F9.6 mag HaApermag3 Halpha-band Vega magnitude determined with
an aperture radius of sqrt(2)*core radius
(hApermag3) (1)
506-516 F11.6 mag e_HaApermag3 rms uncertainty on HApermag3 (hApermag3_err)
518-526 F9.6 mag HaApermag4 Halpha-band Vega magnitude determined with
an aperture radius of 2*core radius
(hApermag4) (1)
528-538 F11.6 mag e_HaApermag4 rms uncertainty on HApermag4 (hApermag4_err)
540-548 F9.6 mag HaApermag5 Halpha-band Vega magnitude determined with
an aperture radius of 2sqrt(2)*core radius
(hApermag5) (1)
550-560 F11.6 mag e_HaApermag5 rms uncertainty on hApermag5 (hApermag5_err))
564-565 I2 --- HaClass [-9/1] Morphological classification based on
the shape of the PSF for Hα-band
(hClass) (G1)
567-575 F9.6 mag HaTiltmag Halpha magnitude (hTiltmag)
577-587 F11.6 mag e_HaTiltmag rms uncertainty on HTiltmag (hTiltmag_err)
589-593 I5 --- HaPointer ID number in the Halpha-band single-filter
catalog (hPointer) (2)
595-603 F9.6 rad RArd Right ascension of object on the sky in
radian (J2000) (RA) (3)
605-613 F9.6 rad DErd Declination of object on the sky in
radian (J2000) (DEC) (3)
--------------------------------------------------------------------------------
Note (1): The core radius is equal to the median seeing as determined from the
PSF of the stars on the respective detectors. The above are a series of
different radii soft-edged apertures designed to adequately sample the
curve-of-growth of the majority of images and to provide fixed-sized aperture
fluxes for all images. An rcore-radius aperture contains roughly 2/3 of the
total flux of stellar images.
The aperture fluxes are sky-corrected integrals (summations) with a soft-edge
(i.e. prorata flux division for boundary pixels). However, for overlapping
images they are more subtle than this since they are in practice
simultaneously fitted top-hat functions, to minimise the effects of crowding.
Images external to the blend are also flagged and not included in the large
radius summations.
Note (2): Pointer is an integer, and can be used to find the object in the
single-band catalogues. This corresponds to the entry 'Number' in the
single-filter catalogues. So rPointer points to the r-band catalogue of a
given field, iPointer to the i-band catalogue etc.
Note (3): Sky coordinates of the source in the r' filter image. The order in
which coordinates are chosen here is hierarchical: first r', if that is not
available i', else Halpha.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: mercat2/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.3 --- Xi Intensity-weighted isophotal
centre-of-gravity in X (Xi)
11- 19 F9.3 --- Xn Intensity-weighted isophotal
centre-of-gravity in Y (Xn)
21- 29 F9.6 mag rApermag1 r-band Vega magnitude determined with an
aperture radius of 1/2*core radius
(rApermag1) (1)
31- 41 F11.6 mag e_rApermag1 rms uncertainty on rApermag1 (rApermag1_err)
43- 51 F9.6 mag rApermag2 r-band Vega magnitude determined with an
aperture radius of 1*core radius
(rApermag2) (1)
53- 63 F11.6 mag e_rApermag2 rms uncertainty on rApermag2 (rApermag2_err)
65- 73 F9.6 mag rApermag3 r-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(rApermag3) (1)
75- 85 F11.6 mag e_rApermag3 rms uncertainty on rApermag3 (rApermag3_err)
87- 95 F9.6 mag rApermag4 r-band Vega magnitude determined with an
aperture radius of 2*core radius
(rApermag4) (1)
97-107 F11.6 mag e_rApermag4 rms uncertainty on rApermag4 (rApermag4_err)
109-117 F9.6 mag rApermag5 r-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(rApermag5) (1)
119-129 F11.6 mag e_rApermag5 rms uncertainty on rApermag5 (rApermag5_err)
133-134 I2 --- rClass [-9/1] Morphological classification based on
the shape of the PSF for r-band
(rClass) (G1)
136-144 F9.6 mag rTiltmag r-band Vega magnitude (rTiltmag)
146-156 F11.6 mag e_rTiltmag rms uncertainty on rTiltmag (rTiltmag_err)
158-162 I5 --- rPointer ID number in the r-band single-filter
catalog (rPointer) (2)
164-172 F9.6 mag iApermag1 i-band Vega magnitude determined with an
aperture radius 0f 1/2*core radius
(iApermag1) (1)
174-184 F11.6 mag e_iApermag1 rms uncertainty on iApermag1 (iApermag1_err)
186-194 F9.6 mag iApermag2 i-band Vega magnitude determined with an
aperture radius of 1*core radius
(iApermag2) (1)
196-206 F11.6 mag e_iApermag2 rms uncertainty on iApermag2 (iApermag2_err)
208-216 F9.6 mag iApermag3 i-band Vega magnitude determined with an
aperture radius of sqrt(2)*core radius
(iApermag3) (1)
218-228 F11.6 mag e_iApermag3 rms uncertainty on iApermag3 (iApermag3_err)
230-238 F9.6 mag iApermag4 i-band Vega magnitude determined with an
aperture radius of 2*core radius
(iApermag4) (1)
240-250 F11.6 mag e_iApermag4 rms uncertainty on iApermag4 (iApermag4_err)
252-260 F9.6 mag iApermag5 i-band Vega magnitude determined with an
aperture radius of 2sqrt(2)*core radius
(iApermag5) (1)
262-272 F11.6 mag e_iApermag5 rms uncertainty on iApermag5 (iApermag5_err)
276-277 I2 --- iClass [-9/1] Morphological classification based
on the shape of the PSF for i-band
(iClass) (G1)
279-287 F9.6 mag iTiltmag g-band magnitude (iTiltmag)
289-299 F11.6 mag e_iTiltmag rms uncertainty on iTiltmag (iTiltmag_err)
301-305 I5 --- iPointer ID number in the i-band single-filter
catalog (iPointer) (2)
307-315 F9.6 mag HaApermag1 Halpha-band Vega magnitude determined with
an aperture radius 0f 1/2*core radius
(hApermag1) (1)
317-327 F11.6 mag e_HaApermag1 rms uncertainty on HApermag1 (hApermag1_err)
329-337 F9.6 mag HaApermag2 Halpha-band Vega magnitude determined with
an aperture radius of 1*core radius
(hApermag2) (1)
339-349 F11.6 mag e_HaApermag2 rms uncertainty on HApermag2 (hApermag2_err)
351-359 F9.6 mag HaApermag3 Halpha-band Vega magnitude determined with
an aperture radius of sqrt(2)*core radius
(hApermag3) (1)
361-371 F11.6 mag e_HaApermag3 rms uncertainty on HApermag3 (hApermag3_err)
373-381 F9.6 mag HaApermag4 Halpha-band Vega magnitude determined with
an aperture radius of 2*core radius
(hApermag4) (1)
383-394 F12.6 mag e_HaApermag4 rms uncertainty on HApermag4 (hApermag4_err)
396-404 F9.6 mag HaApermag5 Halpha-band Vega magnitude determined with
an aperture radius of 2sqrt(2)*core radius
(hApermag5) (1)
406-417 F12.6 mag e_HaApermag5 rms uncertainty on HApermag5 (hApermag5_err)
421-422 I2 --- HClass [-9/1] Morphological classification based on
the shape of the PSF for Halpha-band
(hClass) (G1)
424-432 F9.6 mag HaTiltmag Halpha-band magnitude (hTiltmag)
434-444 F11.6 mag e_HaTiltmag rms uncertainty on HTiltmag (hTiltmag_err)
446-450 I5 --- HaPointer ID number in the Halpha-band single-filter
catalog (hPointer) (2)
452-460 F9.6 rad RArd Right ascension of object on the sky in
radian (J2000) (RA) (3)
464-472 F9.6 rad DErd Declination of object on the sky in
radian (J2000) (DEC) (3)
--------------------------------------------------------------------------------
Note (1): The core radius is equal to the median seeing as determined from the
PSF of the stars on the respective detectors. The above are a series of
different radii soft-edged apertures designed to adequately sample the
curve-of-growth of the majority of images and to provide fixed-sized aperture
fluxes for all images. An rcore-radius aperture contains roughly 2/3 of the
total flux of stellar images.
The aperture fluxes are sky-corrected integrals (summations) with a soft-edge
(i.e. prorata flux division for boundary pixels). However, for overlapping
images they are more subtle than this since they are in practice
simultaneously fitted top-hat functions, to minimise the effects of crowding.
Images external to the blend are also flagged and not included in the large
radius summations.
Note (2): Pointer is an integer, and can be used to find the object in the
single-band catalogues. This corresponds to the entry 'Number' in the
single-filter catalogues. So rPointer points to the r-band catalogue of a
given field, iPointer to the i-band catalogue etc.
Note (3): Sky coordinates of the source in the r' filter image. The order in
which coordinates are chosen here is hierarchical: first r', if that is not
available i', else Halpha.
--------------------------------------------------------------------------------
Global notes:
Note (G1): Morphological classification based on the shape of the PSF as
follows:
0 = Noise
1 = Extended
-1 = Stellar
-2 = Borderline stellar
-3 = Borderline extended
-7 = Bad pixel(s) in aperture
-9 = Saturated
--------------------------------------------------------------------------------
Acknowledgements:
Thomas Wevers, t.wevers(at)astro.ru.nl
History:
* 03-May-2016: on-line version
* 05-Jan-2017: conserv.dat nohalpha.dat onlyi.dat files added
(End) Patricia Vannier [CDS] 29-Mar-2016