Energy deposition by X-ray photoelectrons into interstellar molecular clouds

Details Energy deposition by X-ray photoelectrons into interstellar molecular clouds Energy deposition by X-ray photoelectrons into interstellar molecular clouds

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..158v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 10, 1991, p. 158-170.

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28

Energy Transfer, Interstellar Gas, Molecular Clouds, Molecular Interactions, Photoelectrons, Radiative Transfer, X Rays, Electron Energy, Kinetic Energy, Molecular Gases

Scientific paper

The deposition of energy by 100-10,000 eV electrons into molecular hydrogen and helium gas of cosmic abundances and fractional ionization ranging from 10 to the -12th to 0.1 is considered. In order to account for energy deposition by both discrete and continuous degradation processes, the loss spectrum, a form of the Spencer-Fano degradation spectrum particularly suited to describing electron energy deposition in a partially ionized gas is considered. The calculated excitation and ionization yields drop as the fractional ionization increases. The dependences of these yields on fractional ionization are fitted to a form suitable for swift numerical computation.

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