Soft X-ray opacity in hot and photoionized gases

Details Soft X-ray opacity in hot and photoionized gases Soft X-ray opacity in hot and photoionized gases

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..366k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 366-370. Research supported by the University of Cali

Astronomy and Astrophysics

Astrophysics

134

High Temperature Gases, Hydrogen Atoms, Opacity, Photoionization, Plasma Spectra, X Ray Spectra, Atomic Spectra, Bremsstrahlung, Gas Spectroscopy, Hydrogen Plasma, Ionized Gases

Scientific paper

New calculations are presented of the soft X-ray opacity of gas having cosmic elemental abundances, but in a variety of ionization states. Coronal ionization equilibrium is considered over the range of temperatures 10 to the 4th to 3 x 10 to the 8th K and photoionization equilibrium with power-law and thermal bremsstrahlung spectra over a wide range of ionization parameters. The results are displayed in illustrative figures. For temperatures and ionization parameters commonly found in astrophysical plasmas, the opacity (particularly to photons of equal to or less than 1 keV) can be diminished by substantial factors relative to the state in which all atoms are neutral. As the dominant ionization stages change, the positions and contrasts of prominent K-edges also change.

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