Spitzer 70 Micron Source Counts in GOODS-North

August 2006 • 2006ApJ...647L...9F

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

Abstract • 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 σ_c=0.30+/-0.15 mJy (q=5) for the Spitzer 70 μm band.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2006ApJ...647L...9F
• PDF https://iopscience.iop.org/article/10.1086/507149/pdf
• PREPRINT http://arxiv.org/abs/astro-ph/0606676
• DATA https://irsa.ipac.caltech.edu/bibdata/2006/F/2006ApJ...647L...9F.html
• ELECTR https://doi.org/10.1086%2F507149
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0606676