Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4808w&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #48.08; Bulletin of the American Astronomical Society, Vol. 24, p.1200
Other
Scientific paper
We have investigated approximately 100 nearby molecular clouds using the extensive, all-sky data base of IRAS. The clouds in this study cover a wide range of physical properties including visual extinction, size, mass, degree of isolation, homogeneity and morphology. IRAS 100 microns and 60 microns co-added images were used to 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 optical depth images we locate the edges of dark clouds and the dense cores inside them. We have identified a total of 43 clouds (regions with A_v > 2) which contain a total of 255 cores (regions with A_v > 4) and we catalog 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 have developed selection criteria to search the IRAS Point Source Catalog for stars that are likely to be associated with the clouds and we catalog the IRAS sources in each cloud or core. From this we estimate the star formation efficiency of clouds and cores as a function of their mass and surface density.
Daugherty Debra A.
Myers Phil C.
Wood Douglas O. S.
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