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Molecular Clouds in External Galaxies and the Efficiency of Star Formation

Published online by Cambridge University Press:  04 August 2017

Judith S. Young
Judith S. Young*
Affiliation:
6191 Lederle Graduate Research Center, Department of Physics and Astronomy, University of Massachusetts, Amherst, MA 01003

Abstract

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Observations of the molecular cloud distributions in spiral galaxies are reviewed. For the luminous, relatively face-on Sc galaxies, the azimuthally averaged CO distributions are centrally peaked, with H2 surface densities which decrease as a function of radius. For the Sb and Sa galaxies, the CO distributions exhibit central CO holes up to 5 kpc across in a significant fraction of the galaxies studied. In galaxies with this CO morphology, the central hole is coincident with the nuclear bulge of the galaxy. Additionally, the radial distributions of CO and 13CO emission are similar in 10 Sb and Sc galaxies.

Type
II. Large Scale Processes of Star Formation
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 557 - 586
Copyright
Copyright © Reidel 1987 

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