CO detections and IRAS observations of bright radio spiral galaxies at CZ equal or less than 9000 kilometers per second

Details CO detections and IRAS observations of bright radio spiral galaxies at CZ equal or less than 9000 kilometers per second CO detections and IRAS observations of bright radio spiral galaxies at CZ equal or less than 9000 kilometers per second

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298l..31s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. L31-L35. Research supported

Astronomy and Astrophysics

Astronomy

220

Carbon Monoxide, Interstellar Gas, Molecular Clouds, Radio Galaxies, Spiral Galaxies, Stellar Evolution, Far Infrared Radiation, Galactic Nuclei, Infrared Astronomy Satellite, Milky Way Galaxy, Star Formation Rate

Scientific paper

CO emission has been detected from 20 of 21 bright radio spirals with strong extended nuclear sources, including the most distant (NGC 7674) and the most luminous (IC 4553 = Arp 220, NGC 6240) galaxies yet detected in CO. All of these galaxies are rich in molecular gas, with M total(H2) = 3 x 10 to the 8th - 2 x 10 to the 10th solar masses. IRAS observations show that they have a strong far-infrared (FIR) excess, with L(FIR)/L(B) approximately equal to 1-35 and L(FIR) (40-400 microns) approximately equal to 10 to the 10th - 10 to the 12th L solar masses. The primary luminosity source for these radio cores appears to be star formation in molecular clouds. A strong correlation is found between the FIR and extended 21 cm continuum flux, implying that the fraction of massive stars formed is independent of the star formation rate. The ratio L(FIR)/M(H2) provides a measure of the current rate of star formation, which is found to be a factor 3-20 larger in these galaxies than for the ensemble of molecular clouds in the Milky Way. At these rates their molecular gas will be depleted in about 10 to the 8th yr.

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