Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269...96v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 96-106.
Astronomy and Astrophysics
Astronomy
4
Cosmic Dust, Cosmic Gases, Galactic Structure, Infrared Astronomy Satellite, Mass Ratios, Active Galaxies, Interacting Galaxies, Seyfert Galaxies, Starburst Galaxies
Scientific paper
Attention is given to an FIR complete sample of southern galaxies with L(FIR)/L(B) exp 0 approximately greater than 3, for which optical, radio continuum, and CO (J = 1 yields 0) line observations are available. The FIR luminosities of these extreme IRAS galaxies range from 10 exp 9 to 10 exp 12 solar luminosities. Dust masses derived from the IRAS data yield gas-to-dust mass ratios close to the canonical Galactic value only if a two-component dust model is used with warm dust associated with star forming regions and cool dust associated with the general interstellar medium. The optical colors of the galaxies are completely dominated by the emission from the older population of stars already existing before the starburst. The absence of normal nonbarred spiral galaxies in the present sample implies that star formation in spiral arms is not an efficient way to power the FIR emission.
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