Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..250p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 250-259.
Astronomy and Astrophysics
Astronomy
18
Galactic Evolution, Infrared Radiation, Spiral Galaxies, Star Formation, Active Galactic Nuclei, Carbon Monoxide, Infrared Astronomy Satellite, Luminosity, Molecular Clouds
Scientific paper
Only 4 percent of Sas in the Revised Shapley-Ames Catalog with B(T) less than 12 have an infrared luminosity greater than 10 to the 10th solar. This proportion is about one-sixth of the corresponding one for Sbs and Scs. Although the infrared luminosities of most Sa galaxies are dominated by disk emission, the same trend appears in the incidence of nuclear starbursts. IRAS measurements indicate that no more than three Sas out of the entire RSA sample of 166 galaxies have nuclear starbursts that cannot be associated with interactions or active nuclei. Plots of H I fluxes do not strongly correlate with infrared fluxes. Similarly, for at least the infrared selected Sas, the trend of IR flux with CO flux is similar to that of later type spiral galaxies. This would imply that molecular cloud formation is inhibited in Sas, leading to the lack of infrared activity.
Pompea Stephen M.
Rieke George H.
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