HERS82CAT - Herschel Stripe 82 Survey (HerS) Point Source Catalog

Overview

This study presents the first set of maps and band-merged catalog from the Herschel Stripe 82 Survey (HerS). Observations at 250, 350, and 500 micron (µm) were taken with the Spectral and Photometric Imaging Receiver (SPIRE) instrument onboard the Herschel Space Observatory. HerS covers 79 square degrees along the SDSS Stripe 82 to an average depth of 13.0, 12.9, and 14.8 mJy beam^-1 (including confusion) at 250, 350, and 500 um, respectively. HerS was designed to measure correlations with external tracers of the dark matter density field, either point-like (i.e., galaxies selected from radio to X-ray) or extended (i.e., clusters and gravitational lensing), in order to measure the bias and redshift distribution of intensities of infrared-emitting dusty star-forming galaxies and active galactic nuclei. By locating HerS in Stripe 82, the authors maximize the overlap with available and upcoming cosmological surveys. The band-merged catalog contains 3.3 x 10⁴ sources detected at a significance of >~ 3 sigma (including confusion noise). The maps and catalog are available at http://www.astro.caltech.edu/hers/.

This table contains the first HerS band-merged point source catalog based on observations covering 79 deg² in the equatorial Stripe 82, spanning 13 to 37 degrees (0^h 54^m to 2^h 24^m ) in RA, and -2 to +2 degrees in Declination. The SPIRE beams are 18.1, 25.2 and 36.6 arcseconds at 250, 350 and 500 um, respectively. The band-merged catalog was constructed, after filtering, with DESPHOT (Roseboom et al. 2010, MNRAS, 409, 48), using 250-um sources (extracted with STARFINDER: Diolaiti et al. 2000, A&AS, 147, 335) as positional priors. The authors included sources with S/N greater than 3, whose completeness is estimated to be 50% (see Figure 7 of the reference paper), with a false detection rate less than 1%, and which had reasonable residuals (i.e., chi² < 10). Next, they identified obviously extended sources - 24 in total - where their extended nature resulted in them being broken up into multiple components by the filter, and removed them. This results in a catalog with 32,815 sources at 250 um, of which 13,300 and 3,276 have similarly defined 3-sigma detections at 350 and 500 um, respectively. The authors expect a false positive rate of 1.2 +/- 0.2 deg^-2 : thus, across the 79 deg² of HerS, they expect 96 +/- 16 spurious sources.

The following local extended sources were removed:

Name, RA, DEC
NGC 0493,20.537458,0.945361
UGC 00890,20.283333,1.373333
UGC 00892,20.319166,-0.544491
NGC 0428,18.232125,0.981556
NGC 0799,30.551407,-0.100629
NGC 0800,30.549358,-0.130432
NGC 0450,18.876840,-0.860973
NGC 0497,20.599064,-0.875207
NGC 0867,34.269910,1.244202
UGC 01725,33.607833,1.469833
NGC 0570,22.244325,-0.948996
UGC 00711,17.153750,1.641667
UGC 00726,17.489833,-1.749694
NGC 0550,21.677292,2.022361
NGC 0585,22.9255833,-0.9333056
UGC 01123,23.533209,-1.032286
2MASX J01434929-0048547,25.955091,-0.815256
NGC 0856,33.409831,-0.717287
UGC 01698,33.082019,-0.811513
CGCG 385-007,17.256708,1.378194
UGC 00790,18.657792,1.180167
2MFGC 01002,19.930083,1.630778
2MFGC 00979,19.642792,1.747889
UGC 00847,19.768317,-0.138572

Catalog Bibcode

2014ApJS..210...22V

References

The Herschel Stripe 82 Survey (HerS): Maps and Early Catalog

   Viero M.P., Asboth V., Roseboom I.G., Moncelsi L., Marsden G., Mentuch
   Cooper E., Zemcov M., Addison G., Baker A.J., Beelen A., Bock J., Bridge C.,
   Conley A., Devlin M.J., Dore O., Farrah D., Finkelstein S., Font-Ribera A.,
   Geach J.E., Gebhardt K., Gill A., Glenn J., Hajian A., Halpern M., Jogee S.,
   Kurczynski P., Lapi A., Negrello M., Oliver S.J., Papovich C., Quadri R.,
   Ross N., Scott D., Schulz B., Somerville R., Spergel D.N., Vieira J.D.,
   Wang L., Wechsler R.
   <Astrophysical Journal Supplement, Volume 210, article id. 22, 9 pp. (2014)>
   =2014ApJS..210...22V

Provenance

This database table was created by the HEASARC in March 2014 based on a FITS file (v2.0, uploaded Nov 18, 2013, of hers.catalogue_3sig250_no_extended.fits) containing the catalog which was obtained from the HerS web site, viz., http://www.astro.caltech.edu/hers/Catalogs.html. Some of the values for the name parameter in the HEASARC's implementation of this table were corrected in April 2018.

Parameters

Name
The HerS source designation, viz., 'HerS JHHMMSS.s+DDMMSS', based on the J2000.0 equatorial source coordinates. This parameter was created by the HEASARC.

RA
The Right Ascension of the HerS source in the selected equinox. This was given in J2000.0 decimal degrees in the original table.

Dec
The Declination of the HerS source in the selected equinox. This was given in J2000.0 decimal degrees in the original table.

LII
The Galactic Longitude of the HerS source.

BII
The Galactic Latitude of the HerS source.

Flux_250_um
The flux density of the HerS source at 250 um, in mJy.

RMS_250_um
The instrumental noise in the vicinity of the HerS source at 250 um, in mJy.

Flux_250_um_Error
The total noise in the flux density of the HerS source at 250 um, in mJy. This is the rms sum of the instrumental noise I and the confusion noise C (8 mJy) at this wavelength, i.e., sqrt (I² + C²).

Chi_Squared_250_um
The chi-squared statistic of the fit to the HerS source at 250 um.

Flux_350_um
The flux density of the HerS source at 350 um, in mJy.

RMS_350_um
The instrumental noise in the vicinity of the HerS source at 350 um, in mJy.

Flux_350_um_Error
The total noise in the flux density of the HerS source at 350 um, in mJy. This is the rms sum of the instrumental noise I and the confusion noise C (8 mJy) at this wavelength, i.e., sqrt (I² + C²).

Chi_Squared_350_um
The chi-squared statistic of the fit to the HerS source at 350 um.

Flux_500_um
The flux density of the HerS source at 500 um, in mJy.

RMS_500_um
The instrumental noise in the vicinity of the HerS source at 500 um, in mJy.

Flux_500_um_Error
The total noise in the flux density of the HerS source at 500 um, in mJy. This is the rms sum of the instrumental noise I and the confusion noise C (8 mJy) at this wavelength, i.e., sqrt (I² + C²).

Chi_Squared_500_um
The chi-squared statistic of the fit to the HerS source at 500 um.

Location_Flag
This flag parameter indicates the location of the HerS source relative to the scan pattern of the survey. Sources fall in three distinct regions, identified with location_flag = 0 in the wide regions (16,626 sources); = 1 in the deep regions (14,083 sources); or = 2 on the edges (2,106 sources). Wide regions are defined as those having the nominal coverage of two scans, while deep regions are those with three (and sometimes, but rarely, four) scans. Edges are the areas with only one scan of coverage.

Contact Person

Questions regarding the HERS82CAT database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:28:40 EDT