First observations of the CO J = 6-5 transition in starburst galaxies

Details First observations of the CO J = 6-5 transition in starburst galaxies First observations of the CO J = 6-5 transition in starburst galaxies

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9220465h&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Galactic Nuclei, Interstellar Matter, Molecular Gases, Star Formation, Starburst Galaxies, Astronomical Spectroscopy, Carbon Monoxide, Emission Spectra, Line Spectra

Scientific paper

The detection of carbon monoxide (CO) J=6-5 emission from the starburst nuclei of the galaxies, NGC253, M82, and IC342, is reported. The 6-5 transition was used 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 disks clouds. Nuclear gas 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.

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