The luminosity function for field galaxies in the infrared

Statistics – Computation

Scientific paper

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Computational Astrophysics, Galactic Radiation, Infrared Spectra, Seyfert Galaxies, Astronomical Catalogs, Functions (Mathematics), Infrared Astronomy Satellite, Luminosity, Point Sources, Spatial Distribution, Visible Spectrum

Scientific paper

The infrared properties of an unbiased, volume-limited sample of galaxies are estimated from the IRAS point source catalog. The ratio of infrared to optical luminosities and 60 to 100-micron fluxes both increase with increasing luminosity. Seyfert galaxies have relatively hot colors from 60 to 25 microns, but they nonetheless appear to have substantial excesses above the spectra expected from nonthermal processes. Infrared luminosities greater than a billion solar luminosities occur rarely in E galaxies, occasionally in S0s, and frequently for Sa, Sb, and Sc galaxies. On the other hand, luminosities greater than 10 billion solar luminosities are confined almost entirely to Sb and Sc types. The infrared luminosity function is derived; it has a much stronger weighting toward very energetic galaxies than does the optical luminosity function.

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