Details

Autor(en) / Beteiligte

• Frayer, D. T
• Huynh, M. T
• Chary, R
• Dickinson, M
• Elbaz, D
• Fadda, D
• Surace, J. A
• Teplitz, H. I
• Yan, L
• Mobasher, B

Titel

Spitzer 70 Micron Source Counts in GOODS-North

Ist Teil von

• The Astrophysical journal, 2006-08, Vol.647 (1), p.L9-L12

Ort / Verlag

Chicago, IL: IOP Publishing

Erscheinungsjahr

2006

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• We present ultradeep Spitzer 70 km observations of GOODS-North (Great Observatories Origins Deep Survey). For the first time, the turnover in the 70 km 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 km source counts of dN/dS 8 S super(-1.6), consistent with that observed for the faint 24 km sources. An extrapolation of the 70 km source counts to zero flux density implies a total extragalactic background light (EBL) of 7.4 c 1.9 nW m super(-2) sr super(-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 s sub(c) = 0.30 c 0.15 mJy (q = 5) for the Spitzer 70 km band.