The surface brightness of IRAS galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Radiation, Infrared Astronomy Satellite, Brightness Temperature, Cosmic Dust, Disk Galaxies, Radiative Transfer

Scientific paper

Using IRAS measurements, positive correlations are found between both the infrared to optical flux ratio and infrared color temperature, L(60)/L(100), with optical surface brightness. These correlations can be understood by high surface brightness galaxies having: (1) a high star formation rate or (2) a high-space density of stars and dust. In an attempt to interpret the second possiblity, radiative transfer models have been produced for the dust absorption in a galactic disk. These models indicate that the highest surface brightness galaxies may be the most dust obscured (i.e., optically thick) and that the total luminosity (and, hence, mass) of these galaxies may be considerably underestimated.

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