J/A+A/591/A149 Hi-GAL. inner Milky Way: +68≥l≥70 (Molinari+, 2016)
Hi-GAL, the Herschel infrared Galactic Plane Survey: photometric maps and
compact source catalogues.
First data release for the inner Milky Way: +68°≥ l ≥70°.
Molinari S., Schisano E., Elia D., Pestalozzi M., Traficante A.,
Pezzuto S., Swinyard B.M., Noriega-Crespo A., Bally J., Moore T.J.T.,
Plume R., Zavagno A., Di Giorgio A.M., Liu S.J., Pilbratt G.L.,
Mottram J.C., Russeil D., Piazzo L., Veneziani M., Benedettini M.,
Calzoletti L., Faustini F., Natoli P., Piacentini F., Merello M.,
Palmese A., Del Grande R., Polychroni D., Rygl K.L.J., Polenta G.,
Barlow M.J., Bernard J.-P., Martin P.G., Testi L., Ali B., Andre P.,
Beltran M.T., Billot N., Carey S., Cesaroni R., Compiegne M., Eden D.,
Fukui Y., Garcia-Lario P., Hoare M.G., Huang M., Joncas G., Lim T.L.,
Lord S.D., Martinavarro-Armengol S., Motte F., Paladini R., Paradis D.,
Peretto N., Robitaille T., Schilke P., Schneider N., Schulz B.,
Sibthorpe B., Strafella F., Thompson M.A., Umana G., Ward-Thompson D.,
Wyrowski F.
<Astron. Astrophys., 591, A149 (2016)>
=2016A&A...591A.149M 2016A&A...591A.149M (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Milky Way ; Infrared sources
Keywords: dust, extinction - infrared: ISM - stars: formation - Galaxy: disk -
methods: data analysis - techniques: photometric
Abstract:
We present the first public release of high-quality data products
(DR1) from Hi-GAL, the Herschel infrared Galactic Plane Survey. Hi-GAL
is the keystone of a suite of continuum Galactic plane surveys from
the near-IR to the radio and covers five wavebands at 70, 160, 250,
350 and 500µm, encompassing the peak of the spectral energy
distribution of cold dust for 8≲T≲50K. This first Hi-GAL data
release covers the inner Milky Way in the longitude range
68°≳l≳-70° in a |b|≤1° latitude strip.
Photometric maps have been produced with the ROMAGAL pipeline, which
optimally capitalizes on the excellent sensitivity and stability of
the bolometer arrays of the Herschel PACS and SPIRE photometric
cameras. It delivers images of exquisite quality and dynamical range,
absolutely calibrated with Planck and IRAS, and recovers extended
emission at all wavelengths and all spatial scales, from the
point-spread function to the size of an entire 2°x2° "tile"
that is the unit observing block of the survey. The compact source
catalogues were generated with the CuTEx algorithm, which was
specifically developed to optimise source detection and extraction in
the extreme conditions of intense and spatially varying background
that are found in the Galactic plane in the thermal infrared.
Hi-GAL DR1 images are cirrus noise limited and reach the 1σ-rms
predicted by the Herschel Time Estimators for parallel-mode
observations at 60"/s scanning speed in relatively low cirrus emission
regions. Hi-GAL DR1 images will be accessible through a dedicated
web-based image cutout service. The DR1 Compact Source Catalogues are
delivered as single-band photometric lists containing, in addition to
source position, peak, and integrated flux and source sizes, a variety
of parameters useful to assess the quality and reliability of the
extracted sources. Caveats and hints to help in this assessment are
provided. Flux completeness limits in all bands are determined from
extensive synthetic source experiments and greatly depend on the
specific line of sight along the Galactic plane because the background
strongly varies as a function of Galactic longitude. Hi-GAL DR1
catalogues contain 120581, 291858, 280143, 161946, and 85811 compact
sources in the five bands.
Description:
This is the first public data release of high-quality products from
the Herschel Hi-GAL survey. The release comes two years after the end
of the Herschel observing campaign and is the result of extensive
testing of the data reduction and extraction procedures created by
members of the Hi-GAL consortium. The complexity and the large
variation of the background conditions in all Herschel wavelength
bands makes source extraction on the Galactic plane a challenging
task. With Hi-GAL DR1, we provide access
(http://vialactea.iaps.inaf.it) through a cutout service to
high-quality images and compact source catalogues for the Galactic
plane at 70, 160, 250, 350, and 500um in the region
68°≥l≥-70° and |b|≤ 1°.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
higalblu.dat 578 120581 Blue (PACS 70um) band HIGAL Herschel catalog
higalred.dat 578 291858 Red (PACS 160um) band HIGAL Herschel catalog
higalpsw.dat 558 280143 PSW (SPIRE 250um) band HIGAL Herschel catalog
higalpmw.dat 558 161946 PMW (SPIRE 350um) band HIGAL Herschel catalog
higalplw.dat 558 85811 PLW (SPIRE 500um) band HIGAL Herschel catalog
tableb1.dat 159 197 Clumps or clusters of saturated pixels,
crossmatched with IRAS point sources and
RMS sources
--------------------------------------------------------------------------------
See also:
J/A+A/526/A151 : Hi-Gal sources distance determination (Russeil+, 2011)
J/MNRAS/422/1071 : Cores in IR Dark Clouds for 300≤l≤330 (Wilcock+, 2012)
J/A+A/549/A130 : YSOs in Herschel-Hi-GAL survey (Veneziani+, 2013)
J/ApJ/772/45 : Hi-GAL: star formation in the third quadrant (Elia+, 2013)
J/A+A/579/A71 : Infrared emission of young HII regions (Cesaroni+, 2015)
J/A+A/487/253 : RMS survey: 13CO observations of YSOs (Urquhart+ 2008)
J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)
J/ApJS/208/11 : Red MSX Source Survey: massive protostars (Lumsden+, 2013)
http://vialactea.iaps.inaf.it : Via Lactea Home Page
Byte-by-byte Description of file: higalblu.dat higalred.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- rowid Sequential number
8- 29 A22 --- Name Designation of the source
(HIGALPXLLL.llll+B.bbbb) (G1)
31- 40 F10.6 deg GLON Galactic longitude
42- 50 F9.6 deg GLAT Galactic latitude
52- 56 F5.2 deg e_GLON rms uncertainty on GLON
58- 62 F5.2 deg e_GLAT rms uncertainty on GLAT
64- 72 F9.5 deg RAdeg Right ascension (J2000)
74- 83 F10.6 deg DEdeg Declination (J2000)
85-109 A25 --- Image Atlas image name (ATLAS_IMAGE)
111-118 F8.3 pix Xpos X position
120-127 F8.3 pix Ypos Y position
129-134 F6.3 pix e_Xpos rms uncertainty on Xpos
136-141 F6.3 pix e_Ypos rms uncertainty on Ypos
143-151 A9 --- Source Source identification (SOURCE_ID)
153-161 F9.3 Jy Fint Source-integrated flux measured from the
fitting process, uncorrected
(FINT_UNCORR)
163-175 F13.7 Jy Fintc Source-integrated flux measured from the
fitting process after applying
photometric corrections as a function of
the source size, to account for source
non-Gaussianity and for scan speed (FINT)
177-184 F8.3 Jy e_Fintc Uncertainty on the integrated flux
computed by multiplicating the fitted
source residual rms (RMS_TOTAL) by the
fitted source area as estimated by FWHMA
and FWHMB (ERR_FINT)
186-196 F11.3 MJy/sr Fpeak Source peak flux measured from the fitting
process (FPEAK)
198-205 F8.3 MJy/sr e_Fpeak Uncertainty on the peak flux (ERR_FPEAK)
207-212 F6.2 arcsec FWHMA Full width at half maximum of the source
along axis a of the elliptical Gaussian
as determined by fitting engine
214-221 F8.2 arcsec FWHMB Full width at half maximum of the source
along axis b of the elliptical Gaussian
as determined by fitting engine
223-229 F7.2 arcsec e_FWHMA rms uncertainty on FWHMA (ERR_FWHMA)
231-237 F7.2 arcsec e_FWHMB rms uncertainty on FWHMB (ERR_FWHMB)
239-244 F6.1 deg PA [] Position angle of the elliptical
Gaussian (N E)
246-250 F5.1 deg e_PA rms uncertainty on PA
252-263 F12.3 MJy/sr Bckg Background value determined at the source
peak position (BACKGROUND)
265-277 F13.5 MJy/sr Bckga Coefficient a of the zero-order term of
the background obtained by the fit at the
source peak position (BACK_ACOEFF)
279-290 F12.5 MJy/sr Bckgb Coefficient b of the first-order term x of
the background obtained by the fit at the
source peak position (BACK_BCOEFF)
292-303 F12.5 MJy/sr/pix Bckgc Coefficient c of the first-order term y of
the background obtained by the fit at the
source peak position (BACK_CCOEFF)
305-315 F11.5 MJy/sr/pix2 Bckgd Coefficient d of the second-order term x2
of the background obtained by the fit at
the source peak position (BACK_DCOEFF)
317-327 F11.5 MJy/sr/pix2 Bckge Coefficient e of the second-order term y2
of the background obtained by the fit at
the source peak position (BACK_ECOEFF)
329-339 F11.5 MJy/sr/pix2 Bckgf Coefficient f of the second-order term xy
of the background obtained by the fit at
the source peak position (BACK_FCOEFF)
341-353 F13.5 MJy/sr rms Standard deviation, loc, of the residuals
computed within the source area defined
by FWHMA and FWHMB after subtracting the
best fit (RMS_TOTAL)
355-367 F13.5 MJy/sr rmss Standard deviation, loc, of the residuals
computed within the fitting window after
subtracting the best fit, excluding both
the pixels that belong to the source and
the pixels belonging to other sources
that fall within the fitting window
(RMS_SURROUND)
369-377 F9.5 --- SNR Signal-to-noise ratio obtained by dividing
FPEAK by the residual rms over a source
area with FWHMA and FWHMB as semi-axes
(SNR)
--------------------------------------------------------------------------------
Basic detection information
--------------------------------------------------------------------------------
379-387 F9.3 --- detX Relevance of the source in the
second-derivative map along the x-axis
defined as the ratio between the measured
second derivative at source peak position
and the adopted local threshold value
(DET_X)
389-397 F9.3 --- detY Relevance of the source in the
second-derivative map along the y-axis
defined as the ratio between the measured
second derivative at source peak position
and the adopted local threshold value
(DET_Y)
399-407 F9.3 --- detX45 Relevance of the source in the
second-derivative map along the bisector
of the xy-axis defined as the ratio
between the measured second derivative at
source peak position and the adopted
local threshold value (DET_X45)
409-417 F9.3 --- detY45 Relevance of the source in the
second-derivative map along the bisector
of the yx-axis defined as the ratio
between the measured second derivative
at source peak position and the adopted
local threshold value (DET_Y45)
419-427 F9.3 MJy/sr/pix2 detlimX Absolute value for the local detection
limit threshold adopted for the second
derivative along the x-axis coordinate
(DETLIM_X)
429-437 F9.3 MJy/sr/pix2 detlimY Absolute value for the local detection
limit threshold adopted for the second
derivative along the y-axis coordinate
(DETLIM_Y)
439-447 F9.3 MJy/sr/pix2 detlimx45 Absolute value for the local detection
limit threshold adopted for the second
derivative along the bisector of the
first and third quadrant (DETLIM_X45)
449-457 F9.3 MJy/sr/pix2 detlimy45 Absolute value for the local detection
limit threshold adopted for the second
derivative along the bisector of the
second and fourth quadrant (DETLIM_Y45)
459 I1 --- Clump Flag for confusion at detection level
(CLUMP_FLAG) (G3)
461-462 I2 --- Ncomp Number of Gaussian components used
simultaneously in the fitting process
(NCOMP) (G4)
464-467 I4 pix Xcent The x-pixel coordinate of the centre of
the source fitting window in the
original image (XCENT)
469-472 I4 pix Ycent The y-pixel coordinate of the centre of
the source fitting window in the
original image (YCENT)
474-475 I2 pix Xwin Half-width size of the source fitting
window along x coordinate and centred
at XCENT (XWINDOW)
477-478 I2 pix Ywin Half-width size of the source fitting
window along y coordinate and centred
at YCENT (YWINDOW)
480-481 I2 --- NCont Number of other sources falling inside
the fitting window whose presence is
taken into account at fitting stage.
Not all those other sources might have
been fitted at the same time (NCONTAM)
483-486 F4.2 pix Cent Maximum variation in pixels for
adjustment of the fit centre with
respect to the position of detection,
measured as the distance between the
latter and the brightest local (within
three pixels) pixel in the fitting
window (CENT_TOL)
488-491 I4 --- DOF Degrees of freedom of the source
Gaussian fit
--------------------------------------------------------------------------------
Quality flags
--------------------------------------------------------------------------------
493-507 F15.1 --- Chi2 chi2 determined by the fitting engine.
509-520 F12.2 --- Chi2O Estimator of the fidelity between the fit
and the data computed as
phi=(O(i)-F(i))2/F(i), where O(i) is
the observed data in the i pixel of the
fitting window and F(i) is the fitted
value in the same position (CHI2OPP)
522 I1 --- fitst [0/4] Flag returned from the fitting
engine (FIT_STATUS) (G5)
524-525 A2 --- Guess [ABC 0123456789] Flag on quality of
guessed source parameters as determined
at the detection stage (GUESS_FLAG) (G6)
527-533 A7 --- Group [ABC 0123456789] Flag on quality of
guessed source parameters as determined
at the detection stage (GROUP_FLAG) (G6)
535 I1 --- Constr Flag indicating the number of parameters
that reached the tolerance limits allowed
to the fit process (CONSTRAINS) (G8)
-------------------------------------------------------------------------------
Basic extraction information
-------------------------------------------------------------------------------
537-543 F7.3 --- rd2dx Ratio between the second-derivative value
along x direction expected by the fitted
model of the source and the second
derivative derivative measured at the
detection stage (RDETP2DX) (G9)
545-552 F8.3 --- rd2dy Ratio between the second-derivative value
along y direction expected by the fitted
model of the source and the second
derivative measured at the detection
stage. (RDETP2DY)
554-560 F7.3 --- rd2dx45 Ratio between the second-derivative value
along the bisector of the xy direction
expected by the fitted model of the
source and the second derivative measured
at the detection stage. (RDETP2DX45)
562-568 F7.3 --- rd2dy45 Ratio between the second-derivative value
along the bisector of the yx direction
expected by the fitted model of the
source and the second derivative measured
at the detection stage. (RDETP2DY45)
570-575 A6 --- ovlap Flag to indicate whether the source has
been detected and extracted in one or
more adjacent tiles (OVERLAP_FLAG) (G10)
577-578 A2 --- ovflux Flag to indicate which flux values were
adopted if detected and extracted in two
adjacent tiles (OVFLUX_FLAG) (G11)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: higalpsw.dat higalpmw.dat higalplw.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- rowid Sequential number
8- 29 A22 --- Name Designation of the source
(HIGALPXLLL.llll+B.bbbb) (G1)
31- 40 F10.6 deg GLON Galactic longitude
42- 50 F9.6 deg GLAT Galactic latitude
52- 57 F6.2 deg e_GLON rms uncertainty on GLON
59- 64 F6.2 deg e_GLAT rms uncertainty on GLAT
66- 74 F9.5 deg RAdeg Right ascension (J2000)
76- 85 F10.6 deg DEdeg Declination (J2000)
87-111 A25 --- Image Atlas image name (ATLAS_IMAGE)
113-121 F9.3 pix Xpos X position
123-131 F9.3 pix Ypos Y position
133-138 F6.3 pix e_Xpos rms uncertainty on Xpos
140-145 F6.3 pix e_Ypos rms uncertainty on Ypos
147-155 A9 --- Source Source identification (SOURCE_ID)
157-165 F9.3 Jy Fint Source-integrated flux measured from the
fitting process, uncorrected
(FINT_UNCORR)
167-174 F8.3 Jy e_Fint Uncertainty on the integrated flux
computed by multiplicating the fitted
source residual rms (RMS_TOTAL) by the
fitted source area as estimated by FWHMA
and FWHMB (ERR_FINT)
176-185 F10.3 MJy/sr Fpeak Source peak flux measured from the fitting
process (FPEAK)
187-198 F12.3 MJy/sr e_Fpeak Uncertainty on the peak flux (ERR_FPEAK)
200-206 F7.2 arcsec FWHMA Full width at half maximum of the source
along axis a of the elliptical Gaussian
as determined by fitting engine
208-214 F7.2 arcsec FWHMB Full width at half maximum of the source
along axis b of the elliptical Gaussian
as determined by fitting engine
216-224 F9.2 arcsec e_FWHMA rms uncertainty on FWHMA (ERR_FWHMA)
226-234 F9.2 arcsec e_FWHMB rms uncertainty on FWHMB (ERR_FWHMB)
236-241 F6.1 deg PA [] Position angle of the elliptical
Gaussian (N E)
243-247 F5.1 deg e_PA rms uncertainty on PA
249-258 F10.3 MJy/sr Bckg Background value determined at the source
peak position (BACKGROUND)
260-271 F12.5 MJy/sr Bckga Coefficient a of the zero-order term of
the background obtained by the fit at the
source peak position (BACK_ACOEFF)
273-283 F11.5 MJy/sr Bckgb Coefficient b of the first-order term x of
the background obtained by the fit at the
source peak position (BACK_BCOEFF)
285-296 F12.5 MJy/sr/pix Bckgc Coefficient c of the first-order term y of
the background obtained by the fit at the
source peak position (BACK_CCOEFF)
298-307 F10.5 MJy/sr/pix2 Bckgd Coefficient d of the second-order term x2
of the background obtained by the fit at
the source peak position (BACK_DCOEFF)
309-318 F10.5 MJy/sr/pix2 Bckge Coefficient e of the second-order term y2
of the background obtained by the fit at
the source peak position (BACK_ECOEFF)
320-330 F11.5 MJy/sr/pix2 Bckgf Coefficient f of the second-order term xy
of the background obtained by the fit at
the source peak position (BACK_FCOEFF)
332-342 F11.5 MJy/sr rms Standard deviation, loc, of the residuals
computed within the source area defined
by FWHMA and FWHMB after subtracting the
best fit (RMS_TOTAL)
344-354 F11.5 MJy/sr rmss Standard deviation, loc, of the residuals
computed within the fitting window after
subtracting the best fit, excluding both
the pixels that belong to the source and
the pixels belonging to other sources
that fall within the fitting window
(RMS_SURROUND)
356-364 F9.5 --- SNR Signal-to-noise ratio obtained by dividing
FPEAK by the residual rms over a source
area with FWHMA and FWHMB as semi-axes
(SNR)
--------------------------------------------------------------------------------
Basic detection information
--------------------------------------------------------------------------------
366-373 F8.3 --- detX Relevance of the source in the
second-derivative map along the x-axis
defined as the ratio between the measured
second derivative at source peak position
and the adopted local threshold value
(DET_X)
375-382 F8.3 --- detY Relevance of the source in the
second-derivative map along the y-axis
defined as the ratio between the measured
second derivative at source peak position
and the adopted local threshold value
(DET_Y)
384-391 F8.3 --- detX45 Relevance of the source in the
second-derivative map along the bisector
of the xy-axis defined as the ratio
between the measured second derivative at
source peak position and the adopted
local threshold value (DET_X45)
393-400 F8.3 --- detY45 Relevance of the source in the
second-derivative map along the bisector
of the yx-axis defined as the ratio
between the measured second derivative
at source peak position and the adopted
local threshold value (DET_Y45)
402-408 F7.3 MJy/sr/pix2 detlimX Absolute value for the local detection
limit threshold adopted for the second
derivative along the x-axis coordinate
(DETLIM_X)
410-416 F7.3 MJy/sr/pix2 detlimY Absolute value for the local detection
limit threshold adopted for the second
derivative along the y-axis coordinate
(DETLIM_Y)
418-425 F8.3 MJy/sr/pix2 detlimx45 Absolute value for the local detection
limit threshold adopted for the second
derivative along the bisector of the
first and third quadrant (DETLIM_X45)
427-433 F7.3 MJy/sr/pix2 detlimy45 Absolute value for the local detection
limit threshold adopted for the second
derivative along the bisector of the
second and fourth quadrant (DETLIM_Y45)
435 I1 --- Clump Flag for confusion at detection level
(CLUMP_FLAG) (G3)
437 I1 --- Ncomp Number of Gaussian components used
simultaneously in the fitting process
(NCOMP) (G4)
439-442 I4 pix Xcent The x-pixel coordinate of the centre of
the source fitting window in the
original image (XCENT)
444-447 I4 pix Ycent The y-pixel coordinate of the centre of
the source fitting window in the
original image (YCENT)
449-450 I2 pix Xwin Half-width size of the source fitting
window along x coordinate and centred
at XCENT (XWINDOW)
452-453 I2 pix Ywin Half-width size of the source fitting
window along y coordinate and centred
at YCENT (YWINDOW)
455-456 I2 --- NCont Number of other sources falling inside
the fitting window whose presence is
taken into account at fitting stage.
Not all those other sources might have
been fitted at the same time (NCONTAM)
458-461 F4.2 pix Cent Maximum variation in pixels for
adjustment of the fit centre with
respect to the position of detection,
measured as the distance between the
latter and the brightest local (within
three pixels) pixel in the fitting
window (CENT_TOL)
463-466 I4 --- DOF Degrees of freedom of the source
Gaussian fit
--------------------------------------------------------------------------------
Quality flags
--------------------------------------------------------------------------------
468-482 F15.3 --- Chi2 chi2 determined by the fitting engine.
484-497 F14.3 --- Chi2O Estimator of the fidelity between the fit
and the data computed as
phi=(O(i)-F(i))2/F(i), where O(i) is
the observed data in the i pixel of the
fitting window and F(i) is the fitted
value in the same position (CHI2OPP)
499 I1 --- fitst [0/4] Flag returned from the fitting
engine (FIT_STATUS) (G5)
501-502 A2 --- Guess [ABC 0123456789] Flag on quality of
guessed source parameters as determined
at the detection stage (GUESS_FLAG) (G6)
504-510 A7 --- Group [ABC 0123456789] Flag on quality of
guessed source parameters as determined
at the detection stage (GROUP_FLAG) (G6)
512 I1 --- Constr Flag indicating the number of parameters
that reached the tolerance limits allowed
to the fit process (CONSTRAINS) (G8)
-------------------------------------------------------------------------------
Basic extraction information
-------------------------------------------------------------------------------
514-521 F8.3 --- rd2dx Ratio between the second-derivative value
along x direction expected by the fitted
model of the source and the second
derivative derivative measured at the
detection stage (RDETP2DX) (G9)
523-531 F9.3 --- rd2dy Ratio between the second-derivative value
along y direction expected by the fitted
model of the source and the second
derivative measured at the detection
stage. (RDETP2DY)
533-539 F7.3 --- rd2dx45 Ratio between the second-derivative value
along the bisector of the xy direction
expected by the fitted model of the
source and the second derivative measured
at the detection stage. (RDETP2DX45)
541-548 F8.3 --- rd2dy45 Ratio between the second-derivative value
along the bisector of the yx direction
expected by the fitted model of the
source and the second derivative measured
at the detection stage. (RDETP2DY45)
550-555 A6 --- ovlap Flag to indicate whether the source has
been detected and extracted in one or
more adjacent tiles (OVERLAP_FLAG) (G10)
557-558 A2 --- ovflux Flag to indicate which flux values were
adopted if detected and extracted in two
adjacent tiles (OVFLUX_FLAG) (G11)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg GLON Galactic longitude (1)
11- 18 F8.5 deg GLAT Galactic latitude (1)
20- 23 A4 --- Map Map designation (lNNN)
25- 26 I2 --- PixRed ?=- Number of saturated pixels in Red band
28- 29 I2 arcsec ReRed ?=- Radius of the circularised area of the
saturated pixels cluster in Red band
31- 33 I3 --- PixPSW ?=- Number of saturated pixels in PSW band
35- 36 I2 arcsec RePSW ?=- Radius of the circularised area of the
saturated pixels cluster in PSW band
38- 39 I2 --- PixPMW ?=- Number of saturated pixels in PWW band
41- 42 I2 arcsec RePMW ?=- Radius of the circularised area of the
saturated pixels cluster in PMW band
44- 45 I2 --- PixPLW ?=- Number of saturated pixels in PLW band
47- 48 I2 arcsec RePLW ?=- Radius of the circularised area of the
saturated pixels cluster in PLW band
50- 60 A11 --- IRAS IRAS source <60° from the cluster barycentre
62-159 A98 --- RMS RMS sources <40° from the cluster barycentre
--------------------------------------------------------------------------------
Note (1): Centroid position of the cluster at the shortest wavelength where the
saturation conditions exists.
--------------------------------------------------------------------------------
Global notes:
Note (G1): Designation of the source based on its Galactic position in the form
LLL.llll+b.bbbb. The naming convention for the Hi-GAL catalogue has the form
HIGALPXLLL.llll+b.bbbb, where HIGALP stands for the preliminary catalogue,
X stands for the band where the source has been identified among the
possible choices:
B - blue band; R - red band; S - PSW band; M - PMW band; L - PLW band.
Note (G3): A value equal to 0 means that the source was identified from an
isolated group of pixels above the threshold in all the four derivative
directions. Sources belonging to the extraction of the same atlas image having
the same value of this flag belong to the same group of pixels above the
threshold.
Note (G4): The number of Gaussian components includes the source, so the
minimum value is 1, this number is greater than 1 if the source is fit with
other nearby detections.
Note (G5): Possible values of the fitst flag are as follows:
0 = fit convergence failed
1 = convergence reached
2 = convergence reached despite the initial accuracy requested to fitting
engine was set too low
3 = maximum number of iterations in the fitting process reached
4 = problems in fitting due to the initial guess
Note (G6): The form of the Guess and group flags are GN, where
G is a letter defined as:
A = optimal number of positions to estimate the size
B = sufficient number of positions to estimate the size
C = low number of positions to estimate the size
and N is a number defining the quality of initial guess size:
0 = initial estimate failed
1 = good initial estimate for sizes
2 = one of the two guessed sizes was initially estimate as smaller than
the PSF
3 = initial estimates of source sizes were higher than three times the PSF.
Note (G8): Values of 4 indicate that the source flux has higher unreliability
since either the centre and its sizes have reached the maximum
(or the minimum) allowed for the fit engine.
Note (G9): Values closer to one indicate a higher reliability of the source
Note (G10): Overlap flag:
H indicates that the source has been detected in the tile named in
column ATLAS_IMAGE
E,W indicate that the source is detected only in the eastern or western
adjacent tile, respectively (east is higher Galactic longitude);
if the source has been detected in both H and E or W, then the name of the
adjacent tile is also listed (e.g. H_l060). In these cases, the entry in
the catalogue is the one with the highest S/N.
Note (G11): Ovflux flag:
0 indicates that the source has been detected only once and therefore all
fluxes refer to this detection
-1 indicates that the two fluxes differ by more than 15%; the one listed is
that with the highest S/N
1 indicates that both integrated fluxes lie within 15%, the one in the
catalogue is that with the highest S/N
2 indicates that the integrated fluxes differ by more than 15% but FPEAK
are within 15%; the one listed is that with the highest S/N
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History:
Copied at http://tools.asdc.asi.it/HiGAL.jsp
(End) Patricia Vannier [CDS] 31-Aug-2016