J/A+A/688/A203 The new Herschel/PACS Point Source Catalogue (Marton+, 2024)
The new Herschel/PACS Point Source Catalogue.
Marton G., Gezer I., Madarasz M., Dionatos O., Audard M., Roquette J.,
Hernandez D., Paladini R., Altieri B.
<Astron. Astrophys. 688, A203 (2024)>
=2024A&A...688A.203M 2024A&A...688A.203M (SIMBAD/NED BibCode)
ADC_Keywords: Fundamental catalog ; Stars, pre-main sequence ; YSOs ;
Photometry, infrared ; Galaxies, IR
Keywords: methods: data analysis - space vehicles: instruments -
techniques: photometric - catalogs - stars: protostars
Abstract:
Herschel operated as an observatory, therefore it did not cover the
whole sky, but still observed ∼8% of it. The first version of an
overall Herschel/PACS Point Source Catalogue was released in 2017. The
data are still unique and are very important for research, especially
because no new far-infrared mission is foreseen for at least the next
decade. In the framework of the NEMESIS project, we revisited all the
photometric observations obtained by the PACS instrument on-board of
the Herschel space observatory.
We aimed to build the most complete and most accurate Herschel/PACS
catalogue to date. Our primary goal was to increase the number of real
sources, and decrease the number of spurious sources identified on a
strongly variable background. Our goal was to build a blind catalogue,
meaning that source extraction is conducted without relying on prior
detections at various wavelengths, allowing us to detect sources never
catalogued before.
We define a hybrid strategy that includes classical and ML source
identification and characterisation methods, providing catalogues at
much higher completeness levels than before. Quality assessment also
involves ML techniques. Our source extraction methodology facilitates
a systematic and impartial comparison of sensitivity levels across
various Herschel fields, a task that was typically beyond the scope of
individual programs.
We created a high-reliability and a rejected source catalogue for each
PACS passband, i.e., at 70, 100, and 160um. With the high-reliability
catalogue, we managed to significantly increase the completeness in
all bands. At the same time, while the number of high-reliability
detections decreased, the number of sources matching with existing
catalogues increased, suggesting that the purity is also higher than
before. The photometric accuracy of our pipeline is ∼1% based on
comparison with the standard star models.
Description:
We compiled 6 different catalogue files from the photometric
observations of the PACS instrument on-board the Herschel Space
Observatory. For each photometric band (BS, BL and R, centered at the
wavelengths 70, 100 and 160um, respectively) a high reliability and a
rejected catalogue is presented. The high reliability tables contain
sources only with S/N≥3. In case of multiple detections of the same
object the best detection is kept in the high reliability catalogues.
The rejected source tables contain sources with S/N≥1. In case of
multiple detections of the same object, those with the lower S/N ratio
are added to these tables.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
bshrcds.dat 127 90864 High-reliability BS band catalogue
blhrcds.dat 127 65068 High-reliability BL band catalogue
rhrcds.dat 127 152702 High-reliability R band catalogue
bsrejcds.dat 127 12978 Rejected source BS band catalogue
blrejcds.dat 127 20205 Rejected source BL band catalogue
rrejcds.dat 127 141822 Rejected source R band catalogue
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See also:
VIII/106 : Herschel/PACS Point Source Catalogs (Herschel team, 2017)
Byte-by-byte Description of file: blhrcds.dat blrejcds.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension (J2000.0)
12- 21 F10.6 deg DEdeg Declination (J2000.0)
23- 30 F8.6 deg e_RAdeg Error of right ascension
32- 39 F8.6 deg e_DEdeg Error of declination
41- 51 F11.3 mJy F100 Flux density at 1000m
53- 63 F11.3 mJy e_F100 Error of flux density at 1000m
65- 72 F8.3 --- S/N Signal-to-noise ratio
74- 83 F10.3 MJy/sr strn Structure noise value
85- 91 F7.3 arcsec FWHMX ?=-99.999 FWHM value along the major axis
(-99.999 if gaussian fitting failed)
93- 99 F7.3 arcsec FWHMY ?=-99.999 FWHM value along the minor axis
(-99.999 if gaussian fitting failed)
101-110 A10 --- ObsId Observation identifier of the map in
which the source was detected
112-113 A2 --- Band PACS photometric band (G1)
115-118 A4 --- Level Product level of the used map
120-127 A8 --- Mode Observation mode of the used map
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Byte-by-byte Description of file: bshrcds.dat bsrejcds.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension (J2000.0)
12- 21 F10.6 deg DEdeg Declination (J2000.0)
23- 30 F8.6 deg e_RAdeg Error of right ascension
32- 39 F8.6 deg e_DEdeg Error of declination
41- 51 F11.3 mJy F70 Flux density at 70um
53- 63 F11.3 mJy e_F70 Error of flux density at 70um
65- 72 F8.3 --- S/N Signal-to-noise ratio
74- 83 F10.3 MJy/sr strn Structure noise value
85- 91 F7.3 arcsec FWHMX ?=-99.999 FWHM value along the major axis
(-99.999 if gaussian fitting failed)
93- 99 F7.3 arcsec FWHMY ?=-99.999 FWHM value along the minor axis
(-99.999 if gaussian fitting failed)
101-110 A10 --- ObsId Observation identifier of the map in
which the source was detected
112-113 A2 --- Band PACS photometric band (G1)
115-118 A4 --- Level Product level of the used map
120-127 A8 --- Mode Observation mode of the used map
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Byte-by-byte Description of file: rhrcds.dat rrejcds.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension (J2000.0)
12- 21 F10.6 deg DEdeg Declination (J2000.0)
23- 30 F8.6 deg e_RAdeg Error of right ascension
32- 39 F8.6 deg e_DEdeg Error of declination
41- 51 F11.3 mJy F160 Flux density at 160um
53- 63 F11.3 mJy e_F160 Error of flux density at 160um
65- 72 F8.3 --- S/N Signal-to-noise ratio
74- 83 F10.3 MJy/sr strn Structure noise value
85- 91 F7.3 arcsec FWHMX ?=-99.999 FWHM value along the major axis
(-99.999 if gaussian fitting failed)
93- 99 F7.3 arcsec FWHMY ?=-99.999 FWHM value along the minor axis
(-99.999 if gaussian fitting failed)
101-110 A10 --- ObsId Observation identifier of the map in
which the source was detected
112-113 A2 --- Band PACS photometric band (G1)
115-118 A4 --- Level Product level of the used map
120-127 A8 --- Mode Observation mode of the used map
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Blobal notes:
Note (G1): PACS photometric bands as follows:
BS = 70um (Blue; "Blue Short")
BL = 100um (Green; "Blue Long")
R = 160um (Red)
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Acknowledgements:
Gabor Marton, marton.gabor(at)csfk.org
History:
23-Aug-2024: on-line version
13-Sep-2024: Fluxes names corrected
(End) Gabor Marton [CSFK, Hungary], Patricia Vannier [CDS] 11-Jun-2024