2010A&A...518L..30B


Query : 2010A&A...518L..30B

2010A&A...518L..30B - Astronomy and Astrophysics, volume 518, L30-30 (2010/7-2)

Dissecting the cosmic infra-red background with Herschel/PEP.

BERTA S., MAGNELLI B., LUTZ D., ALTIERI B., AUSSEL H., ANDREANI P., BAUER O., BONGIOVANNI A., CAVA A., CEPA J., CIMATTI A., DADDI E., DOMINGUEZ H., ELBAZ D., FEUCHTGRUBER H., FOERSTER SCHREIBER N.M., GENZEL R., GRUPPIONI C., KATTERLOHER R., MAGDIS G., MAIOLINO R., NORDON R., PEREZ GARCIA A.M., POGLITSCH A., POPESSO P., POZZI F., RIGUCCINI L., RODIGHIERO G., SAINTONGE A., SANTINI P., SANCHEZ-PORTAL M., SHAO L., STURM E., TACCONI L.J., VALTCHANOV I., WETZSTEIN M. and WIEPRECHT E.

Abstract (from CDS):

The constituents of the cosmic IR background (CIB) are studied at its peak wavelengths (100 and 160 µm) by exploiting Herschel/PACS observations of the GOODS-N, Lockman Hole, and COSMOS fields in the PACS evolutionary probe (PEP) guaranteed-time survey. The GOODS-N data reach 3σ depths of ∼3.0mJy at 100µm and ∼5.7mJy at 160µm. At these levels, source densities are 40 and 18 beams/source, respectively, thus hitting the confusion limit at 160µm. Differential number counts extend from a few mJy up to 100-200mJy, and are approximated as a double power law, with the break lying between 5 and 10mJy. The available ancillary information allows us to split number counts into redshift bins. At z≤0.5 we isolate a class of luminous sources (LIR∼1011L), whose SEDs resemble late-spiral galaxies, peaking at ∼130µm restframe and significantly colder than what is expected on the basis of pre-Herschel models. By integrating number counts over the whole covered flux range, we obtain a surface brightness of 6.36±1.67 and 6.58±1.62[nW/m2/sr] at 100 and 160µm, resolving ∼45% and ∼52% of the CIB, respectively. When stacking 24µm sources, the inferred CIB lies within 1.1σ and 0.5σ from direct measurements in the two bands, and fractions increase to 50% and 75%. Most of this resolved CIB fraction was radiated at z≤1.0, with 160µm sources found at higher redshift than 100µm ones.

Abstract Copyright:

Journal keyword(s): infrared: diffuse background - infrared: galaxies - cosmic background radiation - galaxies: statistics - galaxies: evolution

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1136 1
2 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1205 1
3 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1437 0
4 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2337 0
5 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 776 0
6 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 983 1
7 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 785 1
8 * gam Dra * 17 56 36.36988 +51 29 20.0242 5.630 3.760 2.230 1.08 0.23 K5III 529 0

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2021.09.23-22:55:40

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