Ionising flux of cosmic background radiation

Details Ionising flux of cosmic background radiation Ionising flux of cosmic background radiation

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.260..508s&link_type=abstract

Nature, vol. 260, Apr. 8, 1976, p. 508, 509. Research supported by the Alfred P. Sloan Foundation and NASA.

Physics

15

Background Radiation, Cosmic Rays, Interstellar Gas, Ionizing Radiation, Radiant Flux Density, Density Distribution, Diffuse Radiation, Galactic Radiation, Particle Flux Density, Quasars

Scientific paper

The indirect method of estimating the diffuse metagalactic flux of ionizing radiation proposed by Sunyaev (1969) is reconsidered in the light of further studies of the interaction of this radiation with galactic gas. An upper limit is derived for the intensity of the metagalactic background radiation to which the neutral interstellar medium is exposed. This limit on the ionizing radiation flux severely restricts the emission from a galactic corona containing gas in the temperature range 100,000 to 1,000,000 K. An upper limit of 10 to the 29.2 erg/sec/Hz is obtained for the mean luminosity radiated by a quasar in the energy band 40-170 eV. The 21-cm observations examined indicate that further than about 30 kpc from the center of the galaxy self-shielding by H II is possible only when the critical metagalactic ionizing flux is not exceeded.

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