The origin of the far-infrared luminosity from spiral galaxies

Details The origin of the far-infrared luminosity from spiral galaxies The origin of the far-infrared luminosity from spiral galaxies

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350l..25d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. L25-L28. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

110

Far Infrared Radiation, H Alpha Line, Interstellar Extinction, Luminosity, Spiral Galaxies, B Stars, H Ii Regions, Stellar Mass

Scientific paper

The relationship between the far-infrared and H-alpha luminosity has been investigated for a sample of 124 spiral galaxies. After correcting the H-alpha luminosities for an average 1 mag of extinction and extrapolating the IRAS 40-120 micron luminosity to 1000 microns, it is found that the mean ratio of H-alpha to far-infrared luminosity is comparable to that expected from H II regions powered by stars with masses larger than 6 solar masses. This result constitutes strong evidence in support of the view that high-mass O and B stars are responsible for both the H-alpha and far-infrared emission in spiral galaxies of high, billion solar luminosities or greater, far-infrared luminosity.

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