Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340l..53m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 340, May 15, 1989, p. L53-L56. Research supported by NASA IRAS Ex
Astronomy and Astrophysics
Astronomy
54
Active Galaxies, Infrared Sources (Astronomy), Interacting Galaxies, Molecular Gases, Monatomic Gases, Carbon Monoxide, H Lines, Interstellar Gas, Luminosity, Nucleons, Star Distribution
Scientific paper
In infrared luminous galaxies the ratio of the CO(1 - 0) to H I integrated fluxes increases with the far-infrared excess, f(fir)/f(b). All infrared active galaxies with f(fir)/f(b) greater than 2 have molecular to atomic gas mass fractions greater than 0.5. Among the galaxies with the higher infrared excesses there are systems with strikingly small atomic mass fractions, where less than 15 percent of the total mass of interstellar gas is in atomic form. The optical morphology of luminous infrared galaxies indicates that the majority, if not all, of these objects are interacting systems. These observations suggest that the overall mass fraction of molecular to atomic gas, and the infrared luminosities per nucleon of interstellar gas are enhanced during galaxy-galaxy interactions.
Mirabel Felix I.
Sanders David B.
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