The size-line width relation and the mass of molecular hydrogen

Details The size-line width relation and the mass of molecular hydrogen The size-line width relation and the mass of molecular hydrogen

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..132i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 132-138.

Astronomy and Astrophysics

Astronomy

26

Hydrogen Clouds, Molecular Clouds, Nebulae, Spectral Line Width, Carbon Monoxide, Emission Spectra, Interstellar Matter, Sky Surveys (Astronomy)

Scientific paper

Some difficulties associated with the problem of cloud definition are considered, with particular regard to the crowded distribution of clouds and the difficulty of choosing an appropriate boundary in such circumstances. A number of tests carried out on the original data suggest that the delta(v) - S relation found by Solomon et al. (1987) is not a genuine reflection of the dynamical state of Giant Molecular Clouds. The Solomon et al. parameters, are insensitive to the actual cloud properties and are unable to distinguish true clouds from the consequences of sampling any crowded region of emission down to a low threshold temperature. The overall effect of such problems is to overestimate both the masses of Giant Molecular Clouds and the number of very large clouds.

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