Statistics – Applications
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..744w&link_type=abstract
Astrophysical Journal, Part 1, vol. 211, Feb. 1, 1977, p. 744-754.
Statistics
Applications
71
Dynamic Characteristics, Interstellar Matter, Line Spectra, Nebulae, Turbulence Effects, Carbon Monoxide, Emission Spectra, Flow Velocity, Molecular Spectra, Radiative Transfer
Scientific paper
Microturbulence and systematic motions are viewed as simplifying assumptions made to facilitate treatment of line formation in molecular clouds, and line intensities calculated in the two approximations are compared to estimate how uncertainties about the actual line-broadening mechanism affect the interpretation of molecular emission lines. For lines formed by two-level molecules in an isothermal homogeneous cloud, the alternative assumptions lead to peak and integrated line intensities which agree within the differences (up to a factor of 3) associated with the ignorance of cloud geometry. New multilevel calculations for CO in the same cloud model bear out the generality of this result. It follows that, within the geometrical uncertainties, the Sobolev (1960) approximation may be used confidently in the numerous applications for which this simple cloud model suffices.
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