Lyman-α Production by Suprathermal Protons

Details Lyman-α Production by Suprathermal Protons Lyman-α Production by Suprathermal Protons

Nov 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970ap%26ss...9..304s&link_type=abstract

Astrophysics and Space Science, Volume 9, Issue 2, pp.304-314

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

At sufficiently low energies, cosmic ray protons capture electrons from interstellar H i and become neutral. In the subsequent cascade to the ground state a Doppler-shifted Ly-α photon may be emitted. The neutral cosmic ray will be excited collisionally by further encounters with the ambient interstellar gas, emitting additional Doppler-shifted Ly-α photons. We give the form of the cosmic ray spectrum down to 10 keV, assuming that there is no cosmic ray injection below 1 MeV. The neutral fraction is evaluated as a function of energy, and the diffuse ultraviolet flux is calculated. Comparison is made with observations in the range 1225 1340 Å. We conclude that far more stringent limits on the flux of subcosmic rays may be obtained by consideration of the heating and ionization of H i regions.

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