The properties of individual giant molecular clouds in M33

Details The properties of individual giant molecular clouds in M33 The properties of individual giant molecular clouds in M33

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..435w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 10, 1990, p. 435-450.

Astronomy and Astrophysics

Astrophysics

95

Molecular Clouds, Spiral Galaxies, Galactic Structure, Interstellar Matter, Mass Spectra, Molecular Gases

Scientific paper

A total of 19 fields in the nearby spiral galaxy M33 have been observed by millimeter-wave interferometer at about 30 pc resolution. A total of 38 individual giant molecular clouds (GMCs) were detected. The velocity widths, diameters, peak brightness temperatures, and masses are very similar to those of Galactic GMCs. The virial and molecular masses for the clouds agree to within 10 percent, confirming for the first time that the Galactic value of the conversion factor alpha from CO flux to H2 column density is valid for an external galaxy. The mass distribution of the M33 clouds is in good agreement with the Galactic mass distribution, but shows a cutoff at masses greater than 400,000 solar. This can be explained in terms of a simple model where the rate of accretion of material by a cloud is balanced by the rate of dissociation of molecular gas by stars within the cloud.

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