Influence of turbulence on the shape of a spectral line: the analytical approach

Details Influence of turbulence on the shape of a spectral line: the analytical approach Influence of turbulence on the shape of a spectral line: the analytical approach

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..242...32s&link_type=abstract

Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p.

Astronomy and Astrophysics

Astrophysics

Turbulence, Molecular Processes, Radio Lines: Ism, Radio Lines: Stars, Masers: Circumstellar Matter

Scientific paper

We consider the propagation of spectral-line radiation in a correlated turbulent atmosphere. The ensembles of turbulent velocities u(r,t) and optical depths, τν, are assumed to be Gaussian. We investigate the explicit analytical solution of the stochastic radiative transfer equation for the intensity Iν of radiation. The scattering term is not taken into account. It is shown that, in addition to the usual Doppler broadening of the spectral line, correlated turbulent motions of atoms and molecules give rise to considerable changes in the shape of a spectral line. We find that the mean intensity I(0)ν (Iν=I(0)ν+I′ν, I′ν = 0) obeys the usual radiative transfer equation with renormalized extinction factor αeffν if the correlation length R0 of the turbulence is small as compared to a photon free path. A simple analytical expression for αeffν is given. This expression integrally depends on the two-point correlation function of the turbulent velocity field.

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