NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-24 T20:32:12 PDT
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For refcode 1991ApJ...382L..75H:
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Copyright by American Astronomical Society. Reproduced by permission
1991ApJ...382L..75H FIRST OBSERVATIONS OF THE CO J = 6-5 TRANSITION IN STARBURST GALAXIES A. I. HARRIS, R. E. HILLS, J. STUT0ZKI, U. U. GRAF, A. P. G. RUSSELL, AND R. GENZEL Received 1991 July 17; accepted 1991 September 13 ABSTRACT We report the detection of carbon monoxide (CO) J = 6-5 emission from the starburst nuclei of the galaxies NGC 253, M82, and IC 342. We have used the 6-5 transition as a thermometer of warm molecular gas in starburst nuclei, unambiguously finding that the nuclear molecular gas in starburst galaxies is substantially warmer than in typical disk clouds. Nuclear-as heating could be either large scale, for example, turbulent motions or cloud-cloud collisions in noncircular bar orbits; more local effects of radiation from high-mass star formation and supernovae; or some combination. High CO excitation temperatures can affect galactic nuclear mass estimates and consequently star formation efficiencies deduced from lower J CO lines. Subject headings: galaxies: individual (IC 342; M82; NGC 253; NGC 6946) - galaxies:interstellar matter interstellar: molecules - stars: formation
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