Journal Article

Accurate free—free Gaunt factors for astrophysical plasmas

Ralph S. Sutherland

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 300, issue 2, pages 321-330
Published in print October 1998 | ISSN: 0035-8711
Published online October 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01687.x
Accurate free—free Gaunt factors for astrophysical plasmas

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New calculations of free—free transition matrix element integrals are performed using modern symbolic computing techniques to evaluate the hypergeometric functions with complex arguments. The results are presented in both graphical and tabular form including accurate extrapolation methods. The results are accurate to the level of ∼ 10−4, beyond which relativistic corrections would be needed, which are not included. The results are also computed over a very wide range of scaled ionic temperature (γ2) and wavelength, extending earlier results to new regimes encountered in highly photoionized and non-equilibrium ionization plasmas. These results will be useful in the spectral range from submillimetre to hard X-ray wavelengths and temperatures from 10 to 109 K.

Keywords: atomic data; atomic processes; plasmas; radiation mechanisms: thermal; ISM: general

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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