Limits on the Galactic and cosmic ionizing fluxes from measurements of H-alpha emission from the high-velocity neutral hydrogen clouds

Details Limits on the Galactic and cosmic ionizing fluxes from measurements of H-alpha emission from the high-velocity neutral hydrogen clouds Limits on the Galactic and cosmic ionizing fluxes from measurements of H-alpha emission from the high-velocity neutral hydrogen clouds

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345l..71s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 345, Oct. 15, 1989, p. L71-L73.

Astronomy and Astrophysics

Astrophysics

57

Galactic Radiation, Hydrogen Clouds, Interstellar Matter, Ionizing Radiation, Relic Radiation, H Alpha Line, Halos, Ionization, Milky Way Galaxy

Scientific paper

An H-alpha surface brightness of 30 mR has been measured at two
positions on high-velocity neutral hydrogen cloud complex C. The
measured value limits the emergent Galactic ionizing flux in the
Galactic halo, and the cosmic ionizing flux, to less than 60,000
photons/sq cm per sec.

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