Dense molecular gas in galactic nuclei

Details Dense molecular gas in galactic nuclei Dense molecular gas in galactic nuclei

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26arv...3...47h&link_type=abstract

Astronomy and Astrophysics Review (ISSN 0935-4956), vol. 3, June 1991, p. 47-90.

Astronomy and Astrophysics

Astrophysics

65

Active Galaxies, Galactic Nuclei, Interstellar Matter, Masers, Molecular Gases, Carbon Monoxide, Galactic Evolution, H I Regions, Hydroxyl Radicals, Milky Way Galaxy, Molecular Clouds

Scientific paper

The results of investigations of cool dense interstellar media are reviewed with particular attention given to observational data. Instrument technologies are described which allow the investigation of circumnuclear gas in the galaxies that are devoid of H I and inaccessible at optical wavelengths. Molecular mass estimates and correlations between nuclear and global galactic properties are described. CO observations are discussed in relation to strongly interacting nearby galaxies, and models of bars and rings are presented. Correlations between the kinematic, physical, and chemical properties of the dense gas and nuclear regions of the Galaxy are listed, and the molecular properties of distant ultraluminous galaxies are reviewed. It is shown that 10 percent of the galaxies measured in H I can be detected in CO, and it is recommended that many high-resolution CO maps be obtained in order to evaluate nuclear gas properties statistically. Other significant techniques are proposed to improve the study of dense molecular gas in galactic nuclei.

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