Mathematics – Logic
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405l..75w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 405, no. 2, p. L75-L78.
Mathematics
Logic
27
Mass Distribution, Molecular Clouds, Star Formation, Interstellar Matter, Mass Spectra
Scientific paper
The structure of Maddalena's cloud, a large anomalous molecular cloud in which star formation is absent to a very low level, is characterized in terms of clumps. The clump mass spectrum is found to be well fit by a power law, dN/dM varies as M exp -1.0 +/- 0.16, flatter than that measured in the same way for the Rosette molecular cloud, a more typical star-forming cloud, and, by extrapolation, flatter than the mass spectrum of all GMCs investigated to date. A Kolmogorov-Smirnov test finds only a 7-percent probability that the mass distribution of the two clouds exhibits the same parent distribution. If the clouds observed are not pathological, the results suggest that: the clumpy structure of molecular clouds is primordial, the mass spectrum of the fragments in a GMC is affected by the evolution of the cloud, and more evolved clouds have a higher fraction of small clumps.
Blitz Leo
Williams Jonathan P.
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