Heating and ionization by X-ray photoelectrons

Details Heating and ionization by X-ray photoelectrons Heating and ionization by X-ray photoelectrons

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..761s&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 761-764.

Astronomy and Astrophysics

Astrophysics

70

Astrophysics, Atomic Excitations, Gas Heating, Interstellar Gas, Photoelectrons, Photoionization, X Rays, Electron Energy, Energy Distribution, Energy Spectra, Helium, High Energy Electrons, Hydrogen, Lyman Alpha Radiation, Monte Carlo Method

Scientific paper

The paper employs a Monte Carlo method to calculate the heating, secondary ionization and Lyman-alpha excitation produced by the energetic electrons released by X-ray photoionization of interstellar gas. The new features of this computation are the inclusion of current cross sections for electron collisional ionization and excitation of H, He(0) and He(+), and a more accurate treatment of the energy spectrum of secondary electrons produced in collisional ionization of these species. These calculations are of value for studies of the interaction of hard X-rays with interstellar gas of various ionization fractions.

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