Star-formation rates, molecular clouds, and the origin of the far-infrared luminosity of isolated and interacting galaxies

Details Star-formation rates, molecular clouds, and the origin of the far-infrared luminosity of isolated and interacting galaxies Star-formation rates, molecular clouds, and the origin of the far-infrared luminosity of isolated and interacting galaxies

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..613s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 613-625. NASA-supported research.

Astronomy and Astrophysics

Astronomy

222

Far Infrared Radiation, Interacting Galaxies, Molecular Clouds, Star Formation Rate, Carbon Monoxide, Cosmic Dust, H Ii Regions, Infrared Astronomy Satellite, Luminosity

Scientific paper

The CO luminosities of 93 galaxies have been determined and are compared with their IRAS FIR luminosities. Strongly interacting/merging galaxies have L(FIR)/L(CO) substantially higher than that of isolated galaxies or galactic giant molecular clouds (GMCs). Galaxies with tidal tails/bridges are the most extreme type with L(FIR)/L(CO) nine times as high as isolated galaxies. Interactions between close pairs of galaxies do not have much effect on the molecular content and global star-formation rate. If the high ratio L(FIR)/L(CO) in strongly interacting galaxies is due to star formation then the efficiency of this process is higher than that of any galactic GMC. Isolated galaxies, distant pairs, and close pairs have an FIR/CO luminosity ratio which is within a factor of two of galactic GMCs with H II regions. The CO luminosities of FIR-luminous galaxies are among the highest observed for any spiral galaxies.

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