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Date and Time of the Query: 2019-07-15 T19:04:41 PDT
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For refcode 1989ApJ...339..712L:
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Copyright by American Astronomical Society. Reproduced by permission
1989ApJ...339..712L GALAXY EVOLUTION AND LARGE-SCALE STRUCTURE IN THE FAR-INFRARED. I. IRAS POINTED OBSERVATIONS CAROL J. LONSDALE AND PERRY B. HACKING Infrared Processing and Analysis Center and Jet Propulsion Laboratory, California Institute of Technology Received 1988 April 18; accepted 1988 September 14 ABSTRACT We have obtained redshifts for 66 galaxies from a sample of 93 60 micron sources detected serendipitously in 22 IRAS deep pointed observations, covering a total area of 18.4 deg^2^. The flux density limit of this survey is 150 mJy, 4 times fainter than the IRAS Point Source Catalog (PSC). The luminosity function is similar in shape with those previously published for samples selected from the PSC, with a median redshift of 0.048 for the fainter sample, but shifted to higher space densities. There is evidence that some of the excess number counts in the deeper sample can be explained in terms of a large-scale density enhancement beyond the Pavo-Indus supercluster. In addition, the faintest counts in the new sample confirm the result of Hacking, Condon, and Houck that faint IRAS 60 micron source counts lie significantly in excess of an extrapolation of the PSC counts assuming no luminosity or density evolution. There are insufficient redshift data to determine whether evolution, as opposed to large-scale structure, is responsible for this faint count excess. Subject to some uncertainty in the absolute local space density of IRAS galaxies, the data are consistent with an upper limit to pure luminosity evolution of ~30% Gyr^-1^. Subject headings: galaxies: evolution - galaxies: photometry - galaxies: redshifts - infrared: sources - luminosity function
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