J/ApJS/174/136 GEMS survey data and catalog (Caldwell+, 2008)
GEMS survey data and catalog.
Caldwell J.A.R., McIntosh D.H., Rix H.-W., Barden M., Beckwith S.V.W.,
Bell E.F., Borch A., Heymans C., Haussler B., Jahnke K., Jogee S.,
Meisenheimer K., Peng C.Y., Sanchez S.F., Somerville R.S., Wisotzki L.,
Wolf C.
<Astrophys. J. Suppl. Ser., 174, 136-144 (2008)>
=2008ApJS..174..136C 2008ApJS..174..136C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Morphology
Keywords: galaxies: evolution - galaxies: structure - surveys
Abstract:
We describe the data reduction and object cataloging for the GEMS
survey, a large-area (800 arcmin2) two-band (F606W and F850LP)
imaging survey with the Advanced Camera for Surveys on the Hubble
Space Telescope, centered on the Chandra Deep Field-South.
Description:
The GEMS collaboration was granted 125 orbits HST time during cycle 11
(GO-9500, PI: Rix) to image a large area centered on the Extended
Chandra Deep Field-South [E-CDF-S; α, δ (J2000.0) =
03:32:25, -27:48:50 using the ACS Wide-field Camera (WFC).
We produced a master catalog, which incorporates the GEMS and COMBO-17
information for the 8565 cross-identified objects. This master catalog
was used for the GEMS science completed to date (see Sect. 1). A small
number of objects were found to be excludable from the GEMS science
sample due to being, e.g., stars (72), too near the survey edge (33),
or spoiled by the interchip gap (62). These sources are noted in the
master catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
gemstot.dat 253 41681 GEMS total source catalog (all sources detected
in the GEMS z850 imaging, (hprototot.cat.dp)
gemsr24.dat 404 8565 GEMS master catalog of sources cross correlated
with COMBO-17 (Wolf et al., 2008, Cat. II/253)
(hprotor24.cat.dp)
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See also:
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007)
Byte-by-byte Description of file: gemstot.dat
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Bytes Format Units Label Explanations
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2- 24 A23 --- GEMS GEMS sexagesimal coordinate-based name
(GEMSzHHMMSS.sspDDMMSS.s)
26- 35 F10.7 deg RAdeg Right ascension (J2000)
38- 48 F11.7 deg DEdeg Declination (J2000)
50- 58 I9 ct Ftot Total flux in F850LP band (SExtr. FLUX_BEST)
60- 65 I6 ct e_Ftot Error on total flux
68- 73 F6.3 mag mtot Total magnitude in F850LP band
(SExtr. MAG_BEST12)
76- 80 F5.3 mag e_mtot Error total magnitude
83- 87 F5.2 --- bck "local" background level
90- 95 I6 pix+2 Area Isophotal area (SExtr. ISOAREA_IMAGE)
98-103 F6.1 pix xpos Image center x coordinate
105-110 F6.1 pix ypos Image center y coordinate
112-116 F5.1 deg PA [] Position angle (SExtr. THETA_IMAGE)
119-123 F5.3 --- Ell Ellipticity
126-130 F5.1 pix FWHM Image FWHM
133-134 I2 --- Flag SExtractor FLAGS
137-140 F4.2 --- S/G [0/1] Stellarity parameter (SExtr. CLASS_STAR)
148-157 A10 --- ACSs ACS source image name
162-174 A13 --- ACSm ACS mask image names
178-181 I4 s TExp Exposure time
184-189 F6.3 mag ABmag0 AB-mag zero point for F850LP band
194-197 F4.2 --- rKron SExtractor Kron aperture radius
200-208 E9.4 --- Cxx SExtractor object ellipse parameter Cxx
210-218 E9.4 --- Cyy SExtractor object ellipse parameter Cyy
220-229 E10.4 --- Cxy SExtractor object ellipse parameter Cxy
232-233 A2 --- --- [na]
239-240 A2 --- --- [na]
246-247 A2 --- --- [na]
252-253 I2 --- Nover Number of overlapping sources
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Byte-by-byte Description of file: gemsr24.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 24 A23 --- GEMS GEMS sexagesimal coordinate-based name
(GEMSzHHMMSS.sspDDMMSS.s)
26- 35 F10.7 deg RAdeg Right ascension (J2000)
38- 48 F11.7 deg DEdeg Declination (J2000)
51- 58 I8 ct Ftot Total flux in F850LP band
(SExtr. FLUX_BEST)
60- 65 I6 ct e_Ftot Error on total flux
68- 73 F6.3 mag mtot Total magnitude in F850LP band
(SExtr. MAG_BEST12)
76- 80 F5.3 mag e_mtot Error total magnitude
83- 87 F5.2 --- bck "local" background level
90- 95 I6 pix+2 Area Isophotal area (SExtr. ISOAREA_IMAGE)
98-103 F6.1 pix xpos image center x coordinate
105-110 F6.1 pix ypos image center y coordinate
112-116 F5.1 deg PA [] Position angle (SExtr. THETA_IMAGE)
119-123 F5.3 --- Ell Ellipticity
126-130 F5.1 pix FWHM Image FWHM
133-134 I2 --- Flag SExtractor FLAGS
137-140 F4.2 --- S/G [0/1] Stellarity parameter
(SExtr. CLASS_STAR)
148-157 A10 --- ACSs ACS source image name
162-174 A13 --- ACSm ACS mask image names
178-181 I4 s TExp Exposure time
184-189 F6.3 mag ABmag0 AB-mag zero point for F850LP band
192-196 F5.3 --- MCz COMBO-17 redshift
199-203 F5.3 arcsec sepAC Angular separation between ACS and COMBO-17
coordinates
206-211 F6.3 mag Rmag Total R-band magnitude from COMBO-17
(SExtr. MAG_BEST)
214-215 I2 --- Nover Number of overlapping sources
218-223 F6.1 pix Xpos Visual-band image x coordinate
226-231 F6.1 pix Ypos Visual-band image y coordinate
236-239 F4.2 pix rKron SExtractor Kron aperture radius
242-250 E9.4 --- Cxx SExtractor object ellipse parameter Cxx
252-260 E9.4 --- Cyy SExtractor object ellipse parameter Cyy
262-271 E10.4 --- Cxy SExtractor object ellipse parameter Cxy
274-278 I5 ---- COMBO-17 COMBO-17 object number (Seq)
281-285 F5.3 --- e_MCz COMBO-17 redshift uncertainty
288-292 F5.3 --- MCzml COMBO-17 peak of redshift-estimate
distribution
296-301 F6.1 Mpc dl COMBO-17 luminosity distance
304-310 F7.3 mag UjMAG COMBO-17 Johnson absolute U
VEGA-magnitudes
313-319 F7.3 mag VjMAG COMBO-17 Johnson absolute V
VEGA-magnitudes
322-328 F7.3 mag BjMAG COMBO-17 Johnson absolute B
VEGA-magnitudes
331-337 F7.3 mag rsMAG COMBO-17 SDSS absolute r magnitude
340-344 F5.3 mag e_Rmag COMBO-17 R-band SExtr. MAG_BEST uncertainty
347-351 F5.3 mag e_UjMAG COMBO-17 M_U mag uncertainties
354-358 F5.3 mag e_VjMAG COMBO-17 M_V mag uncertainties
361-365 F5.3 mag e_BjMAG COMBO-17 M_B mag uncertainties
368-372 F5.3 mag e_rsMAG COMBO-17 M_r mag uncertainty
376 I1 --- Phot COMBO-17 photometry flag (1)
379-384 F6.3 mag ApRmag COMBO-17 aperture Rmag
387-392 F6.3 mag/arcsec2 SuBrR COMBO-17 R-band central surface brightness
394-404 A11 --- Notes Notes
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Note (1): Flags to be read as bits (from right to left):
* bits 0-7 (corresponding to values 0-128) are original SExtractor flags,
* bits 9-11 (corresponding to values 512-2048) set by COMBO-17 photometry:
* bit 9 indicates only potential problem from bright neighbours or reflexes
from the optics (check images);
* bit 10 indicates uncorrected hot pixels,
* bit 11 is set interactively when photometry is erroneous
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History:
Copied at ftp://archive.stsci.edu/pub/hlsp/gems
(End) Patricia Vannier [CDS] 11-Jun-2009