Statistics – Computation
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..268s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 1, 1985, p. 268-274.
Statistics
Computation
197
Emission Spectra, Galactic Nuclei, Interstellar Gas, Photoionization, Quasars, X Ray Astronomy, Astronomical Models, Computational Astrophysics, Electron Energy, Electron Scattering, Radiant Heating, Secondary Emission
Scientific paper
Accurate Monte Carlo computations of the X-ray secondary electron heating, ionization, and excitation of H and He gas in interstellar space and in quasar emission-line clouds, are presented. The fraction of energy deposited in each form is sensitive to the background ionization fraction, x = n(H+)/n(Htot), and can affect the temperature, ionization state, and line emissivities at large depths in X-ray photoionized clouds. Analytic fits are provided for these energy fractions over the range 0.0001-1 for primary electron energies up to many keV. In both broad-line and narrow-line clouds, emission lines sensitive to the energy budget and electron density may be strongly affected.
Shull Michael J.
van Steenberg Michael E.
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