Density distributions in dark clouds

Details Density distributions in dark clouds Density distributions in dark clouds

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..436a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. 436-454.

Astronomy and Astrophysics

Astrophysics

86

Density Distribution, Interstellar Matter, Mass Distribution, Molecular Clouds, Nebulae, Carbon Monoxide, Monte Carlo Method, Stability, Thermodynamic Equilibrium

Scientific paper

The density distributions within seven dark cloud envelopes are investigated by using high-quality 12CO and 13CO J = 1→0 spectra to calculate 13CO and H2 column densities via the local thermodynamic equilibrium approximation. Column densities are analyzed by modeling cloud local density distributions as power laws of the form ρ(r) ∝ r-γ. Most of the clouds are found to be strongly centrally condensed. Using estimated cloud distances and the inferred density laws, local H2 number densities throughout the envelopes are calculated. Implications of the density and the temperature structure for cloud energetics, and for the interpretation of molecular spectral lines observed from dark clouds are considered.

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