VIII/106 Herschel/PACS Point Source Catalogs (Herschel team, 2017)
HPPSC: Herschel/PACS Point Source Catalogue.
Herschel Point Source Catalogue Working Group,
Marton G., Calzoletti L., Perez Garcia A.M., Kiss C., Paladini R.,
Altieri B., Sanchez Portal M., Kidger M.
<Herschel catalogs (2017)>
=2020yCat.8106....0H 2020yCat.8106....0H
ADC_Keywords: Surveys ; Galaxies, IR ; Photometry, millimetric/submm
Mission_Name: Herschel
Keywords: surveys - galaxies: evolution - infrared: galaxies -
submillimetre: galaxies
Abstract:
The Herschel Space Observatory was the fourth cornerstone mission in
the European Space Agency (ESA) science programme. It had excellent
broad band imaging capabilities in the far-infrared (FIR) and
sub-millimetre part of the electromagnetic spectrum. Although the
spacecraft finished observing in 2013, it left a large legacy dataset
that is far from having been fully explored and still has a great
potential for new scientific discoveries. The PACS and SPIRE
photometric cameras observed about 8% of the sky in six different
wavebands. This document describes the Herschel/PACS Point Source
Catalogue (HPPSC), a FIR catalogue based on the broad-band photometric
observations of the PACS instrument with filters centred at 70, 100
and 160um.
We analysed all combined, Level 2.5/Level 3 Herschel/PACS photometric
observations including 682 Parallel Mode, 12932 nominal mode and 1644
SSO maps. The PACS photometer maps that we produced were generated by
applying the JScanam task of the Herschel Interactive Processing
Environment (HIPE) v13.0.0. Sources were identified with the HIPE
implementation of SUSSEXtractor, and the flux densities obtained by
aperture photometry. We found a total of 108319 point sources that are
considered to be reliable in the 70um maps, 131322 at 100um and 251392
point sources in the 160um maps. In addition, our quality control
algorithm identified 546587 candidate sources that were found to be
extended and 7185160 features which did not pass the signal-to-noise
and other criteria to be considered reliable sources. These sources
were included in the Extended Source List and Rejected Source List of
the HPPSC, respectively. The calculated completeness and photometric
accuracy values are based on simulations, where artificial sources
were injected into the observational timeline with well controlled
flux density values. The actual completeness is a complex function of
the source flux, photometric band and the background complexity.
Description:
The PACS instrument onboard Herschel mapped ∼8% of the far-infrared
sky. The broad-band filters were centered at 70, 100 and 160um,
allowing an angular resolution of 5.6", 6.8" and 11.3", respectively.
A total number of 14,842 PACS maps were searched for catalogue
sources, which were obtained as part of 430 different observing
proposals, all performed in standard observing modes, but with a wide
variety of science goals.
The HPPSC pipeline performed source extraction and photometry in a
systematic and homogeneous way. This procedure was followed by a
strict quality check that preferred reliability over completeness. The
primary goal was to collect point sources, with an appearance similar
to the instrument PSF, a criterium met by most sources detected in
extragalactic regions of the sky. But Herschel also observed the
entire Galactic Plane and many star forming regions, where most
detected sources appear slightly extended. These sources were included
in the Herschel/PACS Extended Source List (HPESL). Also, many source
detections were found to be of poor quality or unreliable, not
satisfying one or more of the selection criteria. These detections
were collected and made available in the Herschel/PACS Rejected Source
List (HPRSL). We note that HPESL and HPRSL are not part of the highly
reliable HPPSC. For all entries the relevant observation identifiers
(OBSIDs) are listed, and users are encouraged to check the
corresponding maps in the Herschel Science Archive
(http://archives.esac.esa.int/hsa/whsa). In addition, the observation
table below provides ancillary information about the 14,842 obsids
involved in the catalogues generation:
The first version of the Herschel/PACS Point Source Catalogue (HPPSC
or PPSC), containing more than half million entries distributed among
the three PACS bands, has been released on 17 May 2017.
The catalogue has three major tables, one HPPSC table for each band,
provided as compressed comma-separated value format files. Two
additional tables are provided in the same format: one is a list of
slightly extended sources (HPESL) and one is a rejected source list
(HPRSL).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hppsc070.dat 307 108319 Herschel/PACS Point Source catalog at 70um
hppsc100.dat 307 131322 Herschel/PACS Point Source catalog at 100um
hppsc160.dat 307 251392 Herschel/PACS Point Source catalog at 160um
hpesl.dat 257 546587 Herschel/PACS slightly extended sources list
hprsl.dat 74 7185160 Herschel/PACS rejected source list
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See also:
VI/139 : Herschel Observation Log (Herschel Science Centre, 2013)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
VIII/103 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)
Byte-by-byte Description of file: hppsc070.dat hppsc100.dat hppsc160.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Source name (name) (G1)
28- 32 A5 --- Band Band (blue=70um, green=100um, red=160um)
(band)
34- 54 F21.17 deg RAdeg Right ascension (J2000) (ra)
56- 76 E21.17 deg DEdeg Declination (J2000) (dec)
78- 97 E20.18 deg e_RAdeg Positional uncertainty on Right ascension
(raerr)
99-118 E20.18 deg e_DEdeg Positional uncertainty on Declination
(decerr)
120-134 F15.6 mJy Flux Non-color corrected flux density in Band
(flux)
136-150 F15.6 --- snr Structure noise based signal-to-noise ratio
(snr)
152-177 F26.17 mJy snrnoise Noise derived from S/NS (snrnoise)
179-189 F11.6 --- stn ? Background RMS based signal-to-noise (stn)
190-191 A2 --- n_stn [-I] -I for -Infinity
193-206 F14.6 mJy rms ? Background RMS (rms)
208-221 F14.6 --- strn ?=-99.9 Structure noise (strn)
223-239 F17.15 --- Fratio Flux ratio measured in apertures 6 and 1
(fratio)
241-257 F17.14 arcsec FWHMXfit FWHM of the fitted Gaussian along the
major axis (fwhmxfit)
259-276 F18.14 arcsec FWHMYfit ?=-99.9 FWHM of the fitted Gaussian along the
minor axis (fwhmyfit)
278-285 F8.6 --- Elong Ratio of the FWHMY and FWHMX (flag_elong)
287 A1 --- Edge [ft] t = at least one contributing source
shows ≥10% of map pixels as NaN within
the outer background annulus (edgeflag)
289-292 I4 --- Blend Sources with the same numbers are blended
(flag_blend)
294 A1 --- Warmat [ft] t = the observation was affected by the
"warm" attitude (warmat)
296-305 I10 --- ObsId Observation identifier (obsid)
307 A1 --- SSOmap [ft] t = SSO map reprocessed in the rest sky
frame (ssomapflag)
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Byte-by-byte Description of file: hpesl.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Source name (name) (G1)
28- 32 A5 --- Band Band (blue=70um, green=100um, red=160um)
(band)
34- 54 F21.17 deg RAdeg Right ascension (J2000) (ra)
56- 77 F22.18 deg DEdeg Declination (J2000) (dec)
79- 99 E21.18 deg e_RAdeg Positional uncertainty on Right ascension
(raerr)
101-120 E20.18 deg e_DEdeg Positional uncertainty on Declination
(decerr)
122-148 F27.17 mJy Flux Non-color corrected flux density in Band
(flux)
150-164 F15.6 --- snr Structure noise based signal-to-noise ratio
(snr)
166-176 F11.6 --- stn ? Background RMS based signal-to-noise (stn)
177 A1 --- n_stn [I] I for Infinity
178-190 F13.6 --- strn ? Structure noise (strn)
192-207 F16.13 arcsec FWHMXfit FWHM of the fitted Gaussian along the
major axis (fwhmxfit)
209-226 F18.14 arcsec FWHMYfit ?=-99.9 FWHM of the fitted Gaussian along the
minor axis (fwhmyfit)
228-244 F17.15 --- Elong Ratio of the FWHMY and FWHMX (flag_elong)
246 A1 --- Edge [ft] t = at least one contributing source
shows ≥10% of map pixels as NaN within
the outer background annulus (edgeflag)
248-257 I10 --- ObsId Observation identifier (obsid)
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Byte-by-byte Description of file: hprsl.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- SourceId [1/8254064] Source Id (sourceid)
9- 20 E12.8 deg RAdeg Right ascension (J2000) (ra)
22- 33 E12.8 deg DEdeg Declination (J2000) (dec)
35- 47 E13.8 deg e_RAdeg Positional uncertainty on Right ascension
(raerr)
49- 57 E9.5 deg e_DEdeg Positional uncertainty on Declination
(decerr)
59- 68 I10 --- ObsId Observation identifier (obsid)
70- 74 A5 --- Band Band (blue=70um, green=100um, red=160um)
(band)
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Global notes:
Note (G1): Names as
HPPSC070A_JHHMMSS.s+DDMMSS for 70um catalog,
HPPSC100A_JHHMMSS.s+DDMMSS for 100um catalog and
HPPSC160A_JHHMMSS.s+DDMMSS for 160um catalog.
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History:
Copied at https://www.cosmos.esa.int/web/herschel/pacs-point-source-catalogue
(End) Patricia Vannier [CDS] 22-Jul-2020