2010A&A...518L..17A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET01:37:56

2010A&A...518L..17A - Astronomy and Astrophysics, volume 518, L17-17 (2010/7-2)

Herschel deep far-infrared counts through Abell 2218 cluster-lens.

ALTIERI B., BERTA S., LUTZ D., KNEIB J.-P., METCALFE L., ANDREANI P., AUSSEL H., BONGIOVANNI A., CAVA A., CEPA J., CIESLA L., CIMATTI A., DADDI E., DOMINGUEZ H., ELBAZ D., FOERSTER SCHREIBER N.M., GENZEL R., GRUPPIONI C., MAGNELLI B., MAGDIS G., MAIOLINO R., NORDON R., PEREZ GARCIA A.M., POGLITSCH A., POPESSO P., POZZI F., RICHARD J., 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):

Gravitational lensing by massive galaxy clusters allows study of the population of intrinsically faint infrared galaxies that lie below the sensitivity and confusion limits of current infrared and submillimeter telescopes. We present ultra-deep PACS 100 and 160µm observations toward the cluster lens Abell 2218 to penetrate the Herschel confusion limit. We derive source counts down to a flux density of 1mJy at 100µm and 2mJy at 160µm, aided by strong gravitational lensing. At these levels, source densities are 20 and 10 beams/source in the two bands, approaching source density confusion at 160µm. The slope of the counts below the turnover of the Euclidean-normalized differential curve is constrained in both bands and is consistent with most of the recent backwards evolutionary models. By integrating number counts over the flux range accessed by Abell 2218 lensing (0.94-35mJy at 100µm and 1.47-35mJy at 160µm), we retrieve a cosmic infrared background surface brightness of ∼8.0 and ∼9.9nW/m2/sr, in the respective bands. These values correspond to 55±24% and 77±31% of DIRBE direct measurements. Combining Abell 2218 results with wider/shallower fields, these figures increase to 62±25% and 88±32% CIB total fractions, resolved at 100 and 160µm, disregarding the high uncertainties of DIRBE absolute values.

Abstract Copyright:

Journal keyword(s): surveys - infrared: galaxies - Galaxy: evolution - galaxies: high-redshift gravitational lensing: strong - galaxies: clusters: general

Simbad objects: 6

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Number of rows : 6

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-N Field reg 12 36 55.0 +62 14 15           ~ 952 1
2 [KBV2006] SMM J163541.2+661144 smm 16 35 41.2 +66 11 44           ~ 7 0
3 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 782 1
4 [KBV2006] SMM J163555.2+661150 smm 16 35 55.2 +66 11 50           ~ 8 0
5 [KBV2006] SMM J163555.5+661300 LI? 16 35 55.5 +66 13 00           ~ 8 0
6 NAME SMM J16359+6613 G 16 35 55.62 +66 12 59.5           ~ 59 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-01:37:56

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