An upper limit to hydrogen ionization rates from radio recombination-line observations toward 3C123

Details An upper limit to hydrogen ionization rates from radio recombination-line observations toward 3C123 An upper limit to hydrogen ionization rates from radio recombination-line observations toward 3C123

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..668p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, May 1984, p. 668-671. Research supported by Cornell University and National Radi

Astronomy and Astrophysics

Astronomy

18

Extragalactic Radio Sources, H Lines, Hydrogen Clouds, Hydrogen Recombinations, Ion Production Rates, Absorption Spectra, Carbon, Gas Ionization, Radio Spectra

Scientific paper

The authors have searched for recombination lines of both hydrogen and carbon near 318 MHz, in absorption, in the direction of the background source 3C 123. They find an upper limit to the optical depth of only 3×10-4, even at velocities where the H I optical depth is 2.5. The authors derive an upper limit to the hydrogen ionization rate ζH of (4 - 16)×10-17 s-1. These limits are compatible with expected X-ray and cosmic-ray fluxes, but are too small to be responsible for all the "warm" neutral hydrogen in the galactic disk.

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