A CO(1-0) and CO(2-1) survey of nearby spiral galaxies. I - Data and observations

Details A CO(1-0) and CO(2-1) survey of nearby spiral galaxies. I - Data and observations A CO(1-0) and CO(2-1) survey of nearby spiral galaxies. I - Data and observations

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..887b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 4, p. 887-936.

Astronomy and Astrophysics

Astronomy

117

Carbon Monoxide, Galactic Nuclei, Interstellar Gas, Radial Distribution, Sky Surveys (Astronomy), Spiral Galaxies, H Alpha Line, Interstellar Space, Line Spectra, Starburst Galaxies

Scientific paper

Observational data are presented on 81 galaxies in the (C-12)O(J = 1-0) and/or (C-12)O(J = 2-1) lines. The average CO(2-1) to CO(1-0) line intensity ratio is 0.89 +/- 0.06, a finding consistent with optically thick gas with equal excitation temperatures in both transitions. An exception is in the highly starbursting galaxy NGC 3310, which has a line ratio of 2.6, implying that the gas is warm and possibly optically thin. The radial distribution of the molecular gas is studied and a surprisingly large number of rings is detected, strong evidence against an exponential dropoff of CO intensity. The effect of environment on the above galactic properties and others is addressed.

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