2015A&A...579A..93L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:38:06

2015A&A...579A..93L - Astronomy and Astrophysics, volume 579A, 93-93 (2015/7-1)

GOODS-Herschel: identification of the individual galaxies responsible for the 80-290 µm cosmic infrared background.

LEITON R., ELBAZ D., OKUMURA K., HWANG H.S., MAGDIS G., MAGNELLI B., VALTCHANOV I., DICKINSON M., BETHERMIN M., SCHREIBER C., CHARMANDARIS V., DOLE H., JUNEAU S., LE BORGNE D., PANNELLA M., POPE A. and POPESSO P.

Abstract (from CDS):

We propose a new method of pushing Herschel to its faintest detection limits using universal trends in the redshift evolution of the far infrared over 24µm colours in the well-sampled GOODS-North field. An extension to other fields with less multi-wavelength information is presented. This method is applied here to raise the contribution of individually detected Herschel sources to the cosmic infrared background (CIRB) by a factor 5 close to its peak at 250µm and more than 3 in the 350 and 500µm bands. We produce realistic mock Herschel images of the deep PACS and SPIRE images of the GOODS-North field from the GOODS-Herschel key program and use them to quantify the confusion noise at the position of individual sources, i.e., estimate a ``local confusion noise''. Two methods are used to identify sources with reliable photometric accuracy extracted using 24µm prior positions. The clean index (CI), previously defined but validated here with simulations, which measures the presence of bright 24µm neighbours and the photometric accuracy index (PAI) directly extracted from the mock Herschel images. Both methods converge to comparable depths and fractions of the CIRB resolved into sources individually detected with Herschel. After correction for completeness, thanks to our mock Herschel images, individually detected sources make up as much as 54% and 60% of the CIRB in the PACS bands down to 1.1mJy at 100µm and 2.2mJy at 160µm and 55, 33, and 13% of the CIRB in the SPIRE bands down to 2.5, 5, and 9mJy at 250µm, 350µm, and 500µm, respectively. The latter depths improve the detection limits of Herschel by factors of 5 at 250µm, and 3 at 350µm and 500µm as compared to the standard confusion limit. Interestingly, the dominant contributors to the CIRB in all Herschel bands appear to be distant siblings of the Milky Way (z∼0.96 for λ<300µm) with a stellar mass of M*∼9x1010M .

Abstract Copyright:

Journal keyword(s): infrared: diffuse background - galaxies: statistics - galaxies: photometry

Simbad objects: 3

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Number of rows : 3

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 GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1052 1
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
3 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 914 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:38:06

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