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Published September 2004 | Published + Submitted
Journal Article Open

Far‐infrared Source Counts at 70 and 160 Microns in Spitzer Deep Surveys


We derive galaxy source counts at 70 and 160 μm using the Multiband Imaging Photometer for Spitzer (MIPS) to map the Chandra Deep Field-South (CDF-S) and other fields. At 70 μm, our observations extend upward about 2 orders of magnitude in flux density from a threshold of 15 mJy, and at 160 μm they extend about an order of magnitude upward from 50 mJy. The counts are consistent with previous observations on the bright end. Significant evolution is detected at the faint end of the counts in both bands, by factors of 2-3 over no-evolution models. This evolution agrees well with models that indicate that most of the faint galaxies lie at redshifts between 0.7 and 0.9. The new Spitzer data already resolve about 23% of the cosmic far-infrared background at 70 μm and about 7% at 160 μm.

Additional Information

© 2004. The American Astronomical Society. Received 2004 March 26. Accepted 2004 May 6. 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. Support for this work was provided by NASA through contract 960785 issued by JPL/Caltech. We warmly thank J. Cadien and J.-L. Puget, and the IRS Team for providing us with the Boötes data.

Attached Files

Published - Dole_2004_ApJS_154_87.pdf

Submitted - 0406021.pdf


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