S p i t zer 70 Micron Source Counts in GOODS-North | Zendy

D. T. Frayer | Zendy; Minh Huynh | Zendy; RangaRam Chary | Zendy; Mark Dickinson | Zendy; D. Elbaz | Zendy; D. Fadda | Zendy; J. Surace | Zendy; Harry I. Teplitz | Zendy; Lin Yan | Zendy; Bahram Mobasher | Zendy

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S p i t zer 70 Micron Source Counts in GOODS-North

Author(s) -

D. T. Frayer,

Minh Huynh,

RangaRam Chary,

Mark Dickinson,

D. Elbaz,

D. Fadda,

J. Surace,

Harry I. Teplitz,

Lin Yan,

Bahram Mobasher

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/507149

Subject(s) - physics , source counts , astrophysics , confusion , extrapolation , flux (metallurgy) , statistics , galaxy , mathematics , psychology , materials science , redshift , psychoanalysis , metallurgy

We present ultra-deep Spitzer 70-micron observations of GOODS-North. For thefirst time, the turn-over in the 70-micron Euclidean-normalized differentialsource counts is observed. We derive source counts down to a flux density of1.2mJy. From the measured source counts and fluctuation analysis, we estimate apower-law approximation of the faint 70-micron source counts of dN/dSproportional to S^{-1.6}, consistent with that observed for the faint 24-micronsources. An extrapolation of the 70-micron source counts to zero flux densityimplies a total extragalactic background light (EBL) of 7.4+/-1.9 nW m^{-2}sr^{-1}. The source counts above 1.2mJy account for about 60% of the estimatedEBL. From fluctuation analysis, we derive a photometric confusion level ofsigma_c = 0.30+/-0.15 mJy (q=5) for the Spitzer 70-micron band.Comment: 6 pages including 2 figures and 1 table. Accepted ApJ Letter

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