What ionizes the interstellar hydrogen toward PSR 0950 + 08 and PSR 0823 + 26?

Details What ionizes the interstellar hydrogen toward PSR 0950 + 08 and PSR 0823 + 26? What ionizes the interstellar hydrogen toward PSR 0950 + 08 and PSR 0823 + 26?

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..153r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 153-160.

Astronomy and Astrophysics

Astrophysics

45

B Stars, H Ii Regions, Hydrogen Ions, Interstellar Gas, Interstellar Matter, Pulsars, H I Regions, Hot Stars, Milky Way Galaxy, O Stars, White Dwarf Stars

Scientific paper

Neither H II regions around nearby B stars nor known white dwarf stars can account for the free electron column densities along two well-defined line segments to the pulsars PSR 0950 + 08 and PSR 0823 + 26. The presence of the ionized gas seems to imply either (1) very long mean free path lengths for the absorption of Lyman continuum photons within the ISM (thereby suggesting a very different morphology for interstellar H I from that of the conventional view); or (2) Lyman continuum luminosities for early B or hot white dwarf stars that are more than an order of magnitude larger than currently accepted values; or (3) an additional and as yet unknown ionization source within the Galactic disk.

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