2012A&A...542A..58B


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.21CET16:12:40

2012A&A...542A..58B - Astronomy and Astrophysics, volume 542A, 58-58 (2012/6-1)

HerMES: deep number counts at 250µm, 350µm and 500µm in the COSMOS and GOODS-N fields and the build-up of the cosmic infrared background.

BETHERMIN M., LE FLOC'H E., ILBERT O., CONLEY A., LAGACHE G., AMBLARD A., ARUMUGAM V., AUSSEL H., BERTA S., BOCK J., BOSELLI A., BUAT V., CASEY C.M., CASTRO-RODRIGUEZ N., CAVA A., CLEMENTS D.L., COORAY A., DOWELL C.D., EALES S., FARRAH D., FRANCESCHINI A., GLENN J., GRIFFIN M., HATZIMINAOGLOU E., HEINIS S., IBAR E., IVISON R.J., KARTALTEPE J.S., LEVENSON L., MAGDIS G., MARCHETTI L., MARSDEN G., NGUYEN H.T., O'HALLORAN B., OLIVER S.J., OMONT A., PAGE M.J., PANUZZO P., PAPAGEORGIOU A., PEARSON C.P., PEREZ-FOURNON I., POHLEN M., RIGOPOULOU D., ROSEBOOM I.G., ROWAN-ROBINSON M., SALVATO M., SCHULZ B., SCOTT D., SEYMOUR N., SHUPE D.L., SMITH A.J., SYMEONIDIS M., TRICHAS M., TUGWELL K.E., VACCARI M., VALTCHANOV I., VIEIRA J.D., VIERO M., WANG L., XU C.K. and ZEMCOV M.

Abstract (from CDS):

The Spectral and Photometric Imaging REceiver (SPIRE) onboard the Herschel space telescope has provided confusion limited maps of deep fields at 250µm, 350µm, and 500µm, as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). Unfortunately, due to confusion, only a small fraction of the cosmic infrared background (CIB) can be resolved into individually-detected sources. Our goal is to produce deep galaxy number counts and redshift distributions below the confusion limit at SPIRE wavelengths (∼20mJy), which we then use to place strong constraints on the origins of the cosmic infrared background and on models of galaxy evolution. We individually extracted the bright SPIRE sources (>20mJy) in the COSMOS field with a method using the positions, the flux densities, and the redshifts of the 24µm sources as a prior, and derived the number counts and redshift distributions of the bright SPIRE sources. For fainter SPIRE sources (<20mJy), we reconstructed the number counts and the redshift distribution below the confusion limit using the deep 24µm catalogs associated with photometric redshift and information provided by the stacking of these sources into the deep SPIRE maps of the GOODS-N and COSMOS fields. Finally, by integrating all these counts, we studied the contribution of the galaxies to the CIB as a function of their flux density and redshift. Through stacking, we managed to reconstruct the source counts per redshift slice down to ∼2mJy in the three SPIRE bands, which lies about a factor 10 below the 5σ confusion limit. Our measurements place tight constraints on source population models. None of the pre-existing models are able to reproduce our results at better than 3-σ. Finally, we extrapolate our counts to zero flux density in order to derive an estimate of the total contribution of galaxies to the CIB, finding 10.1–2.3+2.6nW/m2/sr, 6.5–1.6+1.7nW/m2/sr, and 2.8–0.8+0.9nW/m2/sr at 250µm, 350µm, and 500µm, respectively. These values agree well with FIRAS absolute measurements, suggesting our number counts and their extrapolation are sufficient to explain the CIB. We find that half of the CIB is emitted at z=1.04, 1.20, and 1.25, respectively. Finally, combining our results with other works, we estimate the energy budget contained in the CIB between 8µm and 1000µm: 26–3+7nW/m2/sr.

Abstract Copyright:

Journal keyword(s): cosmology: observations - diffuse radiation - galaxies: statistics - galaxies: photometry - submillimeter: galaxies - submillimeter: diffuse background

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 1900 0
2 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 878 1

    Equat.    Gal    SGal    Ecl

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