Calculated X-radiation from optically thin plasmas. VI - Improved calculations for continuum emission and approximation formulae for nonrelativistic average Gaunt factors

Details Calculated X-radiation from optically thin plasmas. VI - Improved calculations for continuum emission and approximation formulae for nonrelativistic average Gaunt factors Calculated X-radiation from optically thin plasmas. VI - Improved calculations for continuum emission and approximation formulae for nonrelativistic average Gaunt factors

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...65..511m&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 65, no. 3, Sept. 1986, p. 511-536. ZWO-supported research.

Astronomy and Astrophysics

Astrophysics

479

Plasma Radiation, Plasma Spectra, X Ray Spectroscopy, Continuous Spectra, Electron Energy, Ionization, X Ray Sources

Scientific paper

The continuum spectrum of an optically thin plasma whose electrons have a Maxwellian energy distribution is calculated for the wavelength range 1 - 1000 Å and temperature range 0.01 - 100 MK. The effect of recombination to excited states on the free-bound emission is taken into account. Simple analytic approximations to the total free-free, free-bound and two-photon Gaunt factors are presented for various wavelength and temperature intervals covering the whole considered range. A simple computer routine for calculating the continuum emission with the aid of this approximation is given.

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