Molecular clouds in the centers of galaxies: Constraints from HCN and CO-13 line emission

Details Molecular clouds in the centers of galaxies: Constraints from HCN and CO-13 line emission Molecular clouds in the centers of galaxies: Constraints from HCN and CO-13 line emission

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..203a&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 205-206 (SEE N93-26706 10-90)

Computer Science

1

Emission Spectra, Galaxies, Molecular Clouds, Rotational Spectra, Hydrocyanic Acid, Molecular Excitation

Scientific paper

We have searched for HCN J=1-0 line emission in the centers of 12 galaxies and have detected it in 10 of them. We have obtained complementary data on J=1-0 and 2-1 transitions of CO-12 and CO-13 in these systems. The ratio of integrated intensities, I(CO 1-0)/I(HCN 1-0) = 25 +/- 11 for this sample. We find that HCN emission of this strength can be produced under conditions of subthermal excitation. In combination with the line ratios in CO and CO-13, HCN puts constraints on the mean conditions of molecular clouds and on the mix of cloud types within the projected beam.

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