Spectral line profiles arising in a one-dimensional expanding medium. I - Rectangular and Doppler absorption coefficients

Details Spectral line profiles arising in a one-dimensional expanding medium. I - Rectangular and Doppler absorption coefficients Spectral line profiles arising in a one-dimensional expanding medium. I - Rectangular and Doppler absorption coefficients

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982velen.......77g&link_type=abstract

Leningradskii Universitet, Vestnik, Matematika, Mekhanika, Astronomiia, Jan. 1982, p. 77-86. In Russian.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Expansion, Intergalactic Media, Radiant Flux Density, Spectral Line Width, Absorptivity, Asymptotic Methods, Doppler Effect, Point Sources, Radiation Distribution, Red Shift, Resonant Frequencies, Stellar Motions, Thermalization (Energy Absorption)

Scientific paper

An analysis is presented of the asymptotic behavior of the profiles of isolated spectral lines formed in an infinite one-dimensional medium, expanding with a constant dimensionless velocity gradient, gamma much less than unity. It is assumed that the radiation field is produced by a point source either in line frequencies or in continuum, and that the observer is at infinity and motionless relative to the source. In the case of line frequencies, it is shown that, compared with the original line, the observer sees a narrowed and red-shifted profile. A qualitative assessment is presented of what happens to the line profile when the infinite medium is 'cut off' at much greater distances from the source than the thermalization length.

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