Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1601w&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #16.01; Bulletin of the American Astronomical Society, Vol. 25, p.1314
Other
2
Scientific paper
We present recent results from our effort to construct and Atlas of Dark Clouds based on the IRAS Sky Survey Atlas (ISSA). The clouds in this study cover a wide range of physical properties including visual extinction, size, mass, degree of isolation, homogeneity and morphology. From the 100 microns and 60 microns images of the ISSA, we calculate the 100 microns optical depth of dust in the clouds. By comparison with (12) CO and (13) CO observations, we convert the dust optical depth images to column density of H2. From the column density images, we locate the edges of dark clouds and the dense cores inside them. We have developed software tools which automatically catalog the clouds, characterize their structures and calculate their physical properties (size, mass, maximum optical depth, etc.). We find that dark clouds are remarkably filamentary, and that the cores within the clouds are often distributed along the filaments. The largest cores are usually connected to other large cores by filaments. We also analyze the kinds of stars that have formed within the clouds and we characterize the star formation efficiency of dark clouds as a function of various physical parameters.
Chen Haibin
Myers Phil C.
Wood Douglas O. S.
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