A Caltech Library Service

Spitzer 70 Micron Source Counts in GOODS-North

Frayer, D. T. and Huynh, M. T. and Chary, R. and Dickinson, M. and Elbaz, D. and Fadda, D. and Surace, J. A. and Teplitz, H. I. and Yan, L. and Mobasher, B. (2006) Spitzer 70 Micron Source Counts in GOODS-North. Astrophysical Journal, 647 (1). L9-L12. ISSN 0004-637X.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present ultradeep Spitzer 70 μm observations of GOODS-North (Great Observatories Origins Deep Survey). For the first time, the turnover in the 70 μm 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 μm source counts of dN/dS ∝ S^−1.6, consistent with that observed for the faint 24 μm sources. An extrapolation of the 70 μm 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 σc = 0.30 ± 0.15 mJy (q = 5) for the Spitzer 70 μm band.

Item Type:Article
Related URLs:
URLURL TypeDescription
Frayer, D. T.0000-0003-1924-1122
Chary, R.0000-0001-7583-0621
Dickinson, M.0000-0001-5414-5131
Elbaz, D.0000-0002-7631-647X
Fadda, D.0000-0002-3698-7076
Surace, J. A.0000-0001-7291-0087
Teplitz, H. I.0000-0002-7064-5424
Yan, L.0000-0003-1710-9339
Additional Information:© 2006. The American Astronomical Society. Received 2006 May 5; accepted 2006 June 26; published 2006 July 28. We thank our colleagues associated with the Spitzer mission who have made these observations possible. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:cosmology: observations—galaxies: evolution—galaxies: high-redshift—infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:FRAapjl06b
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12739
Deposited By: Archive Administrator
Deposited On:22 Dec 2008 17:37
Last Modified:03 Oct 2019 00:31

Repository Staff Only: item control page