Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/210939

Title

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

Author(s)

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

Abstract

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.

Publication type

Journal article

Source

The Astrophysical Journal Supplement Series, Vol. 154, no. 1 (Sep 2004), pp. 87-92

Publication year

2004

FOR Code(s)

0201 Astronomical and Space Sciences;  0306 Physical Chemistry (Incl. Structural);  0305 Organic Chemistry

Keyword(s)

Galaxies: evolution;  Galaxies: statistics;  Infrared: galaxies

Publisher

University of Chicago Press

ISSN

0067-0049

Publisher URL

http://dx.doi.org/10.1086/422472

Copyright

Copyright © 2004 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find an earlier version of the full text here: http://arxiv.org/abs/astro-ph/0406021.

Peer reviewed