A very deep IRAS survey - Constraints on the evolution of starburst galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Evolution, Infrared Astronomy Satellite, Infrared Sources (Astronomy), Luminous Intensity, Red Shift, Star Distribution, Starburst Galaxies, Faint Objects, Flux Density, Interpolation, Parameterization

Scientific paper

Counts of sources (primarily starburst galaxies) from a deep 60 microns IRAS survey published by Hacking and Houck (1987) are compared with four evolutionary models. The counts below 100 mJy are higher than expected if no evolution has taken place out to a redshift of approximately 0.2. Redshift measurements of the survey sources should be able to distinguish between luminosity-evolution and density-evolution models and detect as little as a 20 percent brightening or increase in density of infrared sources per billion years ago (H/0/ = 100 km/s per Mpc). Starburst galaxies cannot account for the reported 100 microns background without extreme evolution at high redshifts.

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