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

被引：22

作者：

Altieri, B. ^{[1
]}

Berta, S. ^{[2
]}

Lutz, D. ^{[2
]}

Kneib, J. -P. ^{[3
]}

Metcalfe, L. ^{[1
]}

Andreani, P. ^{[4
,11
]}

Aussel, H. ^{[10
]}

Bongiovanni, A. ^{[12
,13
]}

Cava, A. ^{[12
,13
]}

Cepa, J. ^{[12
,13
]}

Ciesla, L. ^{[3
]}

Cimatti, A. ^{[7
]}

Daddi, E. ^{[10
]}

Dominguez, H. ^{[8
]}

Elbaz, D. ^{[10
]}

Schreiber, N. M. Foerster ^{[2
]}

Genzel, R. ^{[2
]}

Gruppioni, C. ^{[8
]}

Magnelli, B. ^{[2
]}

Magdis, G. ^{[10
]}

Maiolino, R. ^{[9
]}

Nordon, R. ^{[2
]}

Perez Garcia, A. M. ^{[12
,13
]}

Poglitsch, A. ^{[2
]}

Popesso, P. ^{[2
]}

Pozzi, F. ^{[7
]}

Richard, J. ^{[6
]}

Riguccini, L. ^{[10
]}

Rodighiero, G. ^{[5
]}

Saintonge, A. ^{[2
]}

Santini, P. ^{[9
]}

Sanchez-Portal, M. ^{[1
]}

Shao, L. ^{[2
]}

Sturm, E. ^{[2
]}

Tacconi, L. J. ^{[2
]}

Valtchanov, I. ^{[1
]}

Wetzstein, M. ^{[2
]}

Wieprecht, E. ^{[2
]}

机构：

[1] European Space Astron Ctr, ESA, Herschel Sci Ctr, Madrid 28691, Spain

[2] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[3] Univ Provence, CNRS, Lab Astrophys Marseille, F-13013 Marseille, France

[4] Osserv Astron Trieste, INAF, I-34143 Trieste, Italy

[5] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[6] Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England

[7] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[8] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[9] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[10] Univ Paris Diderot, IRFU SAp, CEA Saclay, Lab AIM,CEA DSM CNRS, F-91191 Gif Sur Yvette, France

[11] ESO, D-85748 Garching, Germany

[12] Univ La Laguna, Dept Astrofis, E-38207 San Cristobal la Laguna, Spain

[13] Univ La Laguna, Inst Astrofis Canarias, E-38207 San Cristobal la Laguna, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 518卷

关键词：

surveys; infrared: galaxies; Galaxy: evolution; galaxies: high-redshift; gravitational lensing: strong; galaxies: clusters: general; GALAXY; SPACE; SPITZER; MODEL; A2218;

D O I：

10.1051/0004-6361/201014634

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 160 mu m observations toward the cluster lens Abell 2218 to penetrate the Herschel confusion limit. We derive source counts down to a flux density of 1 mJy at 100 mu m and 2 mJy at 160 mu m, 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 160 mu m. 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 (0.94-35 mJy at 100 mu m and 1.47-35 mJy at 160 mu m), we retrieve a cosmic infrared background surface brightness of similar to 8.0 and similar to 9.9 nWm(-2) sr(-1), 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 160 mu m, disregarding the high uncertainties of DIRBE absolute values.

引用

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