Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....34..431h&link_type=abstract
Astronomy and Astrophysics, vol. 34, no. 3, Sept. 1974, p. 431-436.
Astronomy and Astrophysics
Astrophysics
8
Background Radiation, Hydrogen, Interstellar Gas, Ultraviolet Radiation, X Rays, Cosmology, Hydrogen Ions, Ion Production Rates, Milky Way Galaxy, Pulsars, Radiant Flux Density, X Ray Spectra
Scientific paper
Calculations show that the existence of a metagalactic X-UV flux of the intensity required to explain the high-latitude soft X-ray observations, plus a reasonable extrapolation toward lower energies, is consistent with the existence of neutral hydrogen in galaxies. Shielding by H II slabs can be effective both in the solar neighborhood and in the peripheries of galaxies out to a radius of 30 to 40 kpc. At earlier cosmological epochs shielding is less efficient. The soft X-ray spectrum as observed by Yentis et al. (1972) is difficult to reconcile with a purely extragalactic origin for the flux. A local source of ionization also may be necessary to explain the pulsar dispersion data.
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