Diffuse interstellar clouds - Number density and volume filling factor

Details Diffuse interstellar clouds - Number density and volume filling factor Diffuse interstellar clouds - Number density and volume filling factor

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..380k&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 2, Apr. 1981, p. 380-383. Statens Naturvidenskabelige Forskningsrad

Mathematics

Probability

21

Clouds, Density (Number/Volume), Gas Density, Interstellar Gas, Diameters, Filling, Probability Distribution Functions

Scientific paper

Recent, very accurate methods for the estimation of the true dimensions of diffuse interstellar clouds are applied to those with diameters ranging from 1.5 to 8.5 pc. The number density of clouds is found to 0.00044/cu pc, and the filling factor valid for distances smaller than 150 pc is 0.016, + or - 0.010. By extrapolation to smaller diameters, an upper limit to the filling factor of 0.02 is suggested. The number of clouds per unit distance, based on the geometrical cloud cross section and convolved with the true diameter distribution is 4.3/kpc, somewhat smaller but still agreeing with the values derived from the color excess distributions of 6-8/kpc.

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