Far-infrared source counts at 70 and 160 microns in Spitzer deep surveys

H. Dole, E. Le Floc'h, P. G. Pérez-González, C. Papovich, E. Egami, G. Lagache, A. Alonso-Herrero, C. W. Engelbracht, K. D. Gordon, D. C. Hines, O. Krause, K. A. Misselt, J. E. Morrison, G. H. Rieke, M. J. Rieke, J. R. Rigby, E. T. Young, L. Bai, M. Blaylock, G. NeugebauerC. A. Beichman, D. T. Frayer, J. R. Mould, P. L. Richards

Research output: Contribution to journalArticlepeer-review

88 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)87-92
Number of pages6
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Sep 2004


  • Galaxies: evolution
  • Galaxies: statistics
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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