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Date and Time of the Query: 2018-12-13 T10:40:57 PST
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For refcode 1990ApJ...351..422S:
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Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...351..422S DENSE MOLECULAR GAS, STAR FORMATION, AND THE CO TO H_2_ CONVERSION FACTOR IN NEARBY GALAXIES LESLIE J. SAGE AND STEVEN N. SHORE Astrophysics Research Center, Department of Physics New Mexico Institute of Mining and Technology AND P. M. SOLOMON Astronomy Program, Department of Earth and Space Science, State University of New York at Stony Brook Received 1989 February 21; accepted 1989 August 22 ABSTRACT A search for CS J = 2->1 emission from 14 nearby galaxies yielded six detections and five marginal detections. The detection of CS emission confirms the presence of large quantities of dense gas near the centers of nearby galaxies. The CS and CO 1 -> 0 fluxes from the centers of galaxies are linearly correlated. The ratio of CS to CO flux is independent of galaxian parameters and can be understood as a consequence of a beam average of two populations of molecular clouds, one similar to Galactic disk clouds, the other similar to Galactic center clouds. Both CS and CO emission are correlated with central C II ({lambda}158 micron) line emission and 100 micron continuum emission, indicating that both molecules trace active star formation. We conclude that the mass of dense gas traced by CS is approximately proportional to the total molecular mass and that a standard CO-H_2_ conversion factor produces a reasonable estimate of the H_2_ mass in most galaxies. Subject headings: galaxies: interstellar matter - molecular processes - stars: formation
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