Interstellar Absorption of Cosmic X Rays

Details Interstellar Absorption of Cosmic X Rays Interstellar Absorption of Cosmic X Rays

Apr 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970phrvd...1.2252b&link_type=abstract

Physical Review D, vol. 1, Issue 8, pp. 2252-2256

Physics

462

Scientific paper

Improved results on the total photo-ionization cross section of atomic helium are given. The total cross section includes contributions from simultaneous ionization and excitation of He+ and double ionization; the combined effect of these two processes adds about 10% to the normal photo-ionization process where He+ is left in the ground state. A lower abundance (10.92 based on 12.00 for hydrogen) is adopted for helium, based on recent radio determinations. In calculating the opacity due to K-shell photo-ionization of heavy elements, a lower abundance (8.00) is also adopted for neon. Brief mention is made of the effects of irregularities in the density distribution of the interstellar gas on the problems of both x-ray and radio-wave absorption.

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