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Interaction of metagalactic X-UV radiation with galactic hydrogen (1974)

Hill, J. K.

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Publication Date: 2019-06-27

Description: 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.

Keywords: SPACE RADIATION

Type: Astronomy and Astrophysics; 34; 3, Se; Sept

Format: text

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