Molecular clouds in starburst galaxy nuclei

Details Molecular clouds in starburst galaxy nuclei Molecular clouds in starburst galaxy nuclei

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..414y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 414-422. Research supported by NASA and Alfred P. Slo

Astronomy and Astrophysics

Astrophysics

27

Galactic Nuclei, Interstellar Matter, Molecular Clouds, Star Formation, Starburst Galaxies, Carbon Monoxide, Charge Coupled Devices, H Alpha Line, Infrared Radiation, Molecular Gases, Rotational Spectra

Scientific paper

New CO observations of a complete sample of starburst galaxies are presented in order to determine the range of molecular gas masses and star-formation efficiencies that characterize these systems. The properties of the galaxies in the sample are given, and the H-alpha and R-band CCD images for six of the galaxies are shown. The novel feature of this study is that the galaxies in this study are infrared selected as opposed to optically selected. They exhibit levels of nuclear star formation activity which are comparable to the starburst galaxies M82 and NGC 253. A subset of galaxies with unusually narrow CO line widths, high star-formation efficiencies, and compact 10-micron distributions is revealed. It is proposed that, if gas distributions in these galaxies are also compact, as the narrow linewidths suggest, the high yields of massive stars per unit mass of molecular gas may be attributed to a star-formation mechanism which becomes more efficient as the gas density increases.

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