A Comparison of Tracers of Cool Gas in Galaxies and the 12CO/13CO Luminosity Ratio in Luminous Infrared Galaxies

Details A Comparison of Tracers of Cool Gas in Galaxies and the 12CO/13CO Luminosity Ratio in Luminous Infrared Galaxies A Comparison of Tracers of Cool Gas in Galaxies and the 12CO/13CO Luminosity Ratio in Luminous Infrared Galaxies

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apjs..135..177g&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 135, Issue 2, pp. 177-182.

Astronomy and Astrophysics

Astronomy

22

Galaxies: Active, Galaxies: Interactions, Galaxies: Ism, Ism: Atoms, Ism: Dust, Extinction, Ism: Molecules

Scientific paper

We present new observations of 12CO (J=2-1), 13CO (J=2-1), and 1.3 mm dust continuum emission toward seven diverse galaxies (IC 10, IRAS 10565+2448, the Antennae-NGC 4038 and 4039, NGC 4736, Mrk 231, and NGC 6090). Compared with the other galaxies in the sample, the two ultraluminous infrared galaxies (ULIGs) exhibit reduced 13CO line luminosities with respect to the 12CO line luminosities and 1.3 mm dust luminosities. These observations parallel the established trend of large R-values in ULIGs compared with more quiescent spiral galaxies. The two luminous merging pairs in our sample with moderate starburst activity, the Antennae and NGC 6090, do not appear to show the large R-values. The results are consistent with models in which 12CO emission is dominated in the most luminous mergers by warm regions of ISM with moderate optical depths (τ12CO~1). For the other galaxies, R is more typical of the optically thick case 10

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