Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..161s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 161-174. Research supported by the Smithsonian Instit
Astronomy and Astrophysics
Astronomy
85
Astronomical Photometry, Infrared Spectra, Radiant Flux Density, Spaceborne Astronomy, Galactic Clusters, Infrared Astronomy Satellite, Luminosity, Red Shift, Visible Spectrum
Scientific paper
Redshift data and accurate four-color infrared photometry are presented for a complete IRAS sample of galaxies brighter than 2 Jy at 60 microns. A simple power law provides a good fit to the distribution for luminosities from 10 to the 10th to 10 to the 12th solar. There is no indication of an exponential dropoff in the luminosity function at high energies. A flattening of the luminosity function occurs at L less than 10 to the 20th solar. The highest luminosity galaxies typically are found in multiple, possibly interacting, systems and exhibit marginally narrower infrared spectral energy distributions than the isolated spirals which predominate at low luminosities. Infrared-bright galaxies come from a different population than the majority of optically bright galaxies. In particular, galaxies of low blue luminosity are not strong infrared emitters.
Huchra John P.
Kleinmann Susan G.
Low Frank J.
Smith Beverly J.
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