Spitzer 70 micron source counts in GOODS-North

被引:106
作者
Frayer, D. T.
Huynh, M. T.
Chary, R.
Dickinson, M.
Elbaz, D.
Fadda, D.
Surace, J. A.
Teplitz, H. I.
Yan, L.
Mobasher, B.
机构
[1] CALTECH, Pasadena, CA 91125 USA
[2] Natl Opt Astron Observ, Tucson, AZ 85726 USA
[3] DAPNIA, Natl Opt Astron, F-91191 Gif Sur Yvette, France
[4] Space Telescope Sci Inst, Baltimore, MD 21218 USA
关键词
cosmology : observations; galaxies : evolution; galaxies : high-redshift; infrared : galaxies;
D O I
10.1086/507149
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present ultradeep Spitzer 70 mu m observations of GOODS-North (Great Observatories Origins Deep Survey). For the first time, the turnover in the 70 mu m Euclidean-normalized differential source counts is observed. We derive source counts down to a flux density of 1.2 mJy. From the measured source counts and fluctuation analysis, we estimate a power-law approximation of the faint 70 mu m source counts of dN/dS proportional to S-1.6, consistent with that observed for the faint 24 mm sources. An extrapolation of the 70 mm source counts to zero flux density implies a total extragalactic background light (EBL) of 7.4 +/- 1.9 nW m(-2) sr(-1). The source counts above 1.2 mJy account for about 60% of the estimated EBL. From fluctuation analysis, we derive a photometric confusion level of sigma(c) = 0.30 +/- 0.15 mJy (q = 5) for the Spitzer 70 mu m band.
引用
收藏
页码:L9 / L12
页数:4
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