Far Infrared Source Counts at 70 and 160 microns in Spitzer Deep Surveys
Abstract
We derive galaxy source counts at 70 and 160 microns using the Multiband Imaging Photometer for Spitzer (MIPS) to map the Chandra Deep Field South (CDFS) and other fields. At 70 microns, our observations extend upwards about 2 orders of magnitude in flux density from a threshold of 15 mJy, and at 160 microns 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 most ofthe 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 microns and about 7% at 160 microns.
Cite
@article{arxiv.astro-ph/0406021,
title = {Far Infrared Source Counts at 70 and 160 microns in Spitzer Deep Surveys},
author = {H. Dole and E. Le Floc'h and P. G. Perez-Gonzalez and C. Papovich and E. Egami and G. Lagache and A. Alonso-Herrero and C. W. Engelbracht and K. D. Gordon and D. C. Hines and O. Krause and K. A. Misselt and J. E. Morrison and G. H. Rieke and M. J. Rieke and J. R. Rigby and E. T. Young and L. Bai and M. Blaylock and G. Neugebauer and C. A. Beichman and D. T. Frayer and J. R. Mould and P. L. Richards},
journal= {arXiv preprint arXiv:astro-ph/0406021},
year = {2009}
}
Comments
Small modifications to match printed version. Models in Differential Counts plots were changed. MIPS Source Counts are available at: http://lully.as.arizona.edu/GTODeep/Counts/ . Accepted for Publication in ApJS Special Issue on Spitzer