Molecular clouds in galaxies with different Z - Fragmentation of diffuse clouds driven by opacity

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 1986 English Publisher:IOP PublishingJournal:Publications of the Astronomical Society of the Pacific, volume 98, page 1,076 (issn: 0004-6280, eissn: 1538-3873,

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Authors: Jose Franco; Donald P. Cox;

doi: 10.1086/131876

Molecular clouds in galaxies with different Z - Fragmentation of diffuse clouds driven by opacity

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Abstract

Molecular clouds are formed from diffuse interstellar clouds when the external ultraviolet radiation field is prevented from penetrating into the cloud. The opacity is provided mainly by dust grains and the required column density to the cloud center is larger than about 5 x 10 to the 20th (solar Z/Z)/sq cm. This high-opacity criterion could have a significant impact on the radial trends observed in spiral galaxies, and on the distinctions between spiral and dwarf irregular galaxies.

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National Autonomous University of Mexico
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