The Distribution of Dust Clouds in the Interstellar Medium

Details The Distribution of Dust Clouds in the Interstellar Medium The Distribution of Dust Clouds in the Interstellar Medium

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...457..764d&link_type=abstract

Astrophysical Journal v.457, p.764

Astronomy and Astrophysics

Astronomy

9

Ism: Dust, Extinction, Ism: Clouds, Ism: Reflection Nebulae

Scientific paper

Murthy, Walker, & Henry (1992) examined 745 O, B, F and G stars on the IRAS Skyflux plates in a search for dust clouds that are heated by the stars and found 123 clouds near 106 stars by detection of excess 60 microns emission. We have reanalyzed their sample using the Infrared Sky Survey Atlas (ISSA) data and found 194 clouds near 138 stars. We find a filling factor of (0.02 1 0.01) for dust of density greater than ˜3.0 H atoms cm-3 to which we are complete. We were able to find a good model fit to the data set with these parameters for the dust clouds: filling factor = 0.085±003 scale height z = 250±100 pc, radius power-law exponent α = -4.26±0.25, and density power-law exponent β = -1.15±0.1, where the filling factor includes material in the density range 0.01-100 H atoms cm-3; however, there is evidence to suggest that the region probed by these stars is a special environment. We also find significantly lower dust densities near O stars than near B stars.

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