Detection of radio recombination lines of hydrogen ionized by cosmic-ray protons in the cool interstellar medium

Details Detection of radio recombination lines of hydrogen ionized by cosmic-ray protons in the cool interstellar medium Detection of radio recombination lines of hydrogen ionized by cosmic-ray protons in the cool interstellar medium

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54..776s&link_type=abstract

Astronomy Reports, Volume 54, Issue 9, pp.776-783

Astronomy and Astrophysics

Astronomy

Scientific paper

The emission of hydrogen radio recombination lines from a cloud of cool interstellar matter toward the radio source Cassiopeia A has been detected. The formation of the radio recombination lines is initiated by cosmic rays. The rate of ionization of the interstellar hydrogen by cosmic-ray protons measured from the radio recombination lines using the most direct method is ζH = (1 ± 0.25)×10-16 s-1. This value of ζH is compared with measurements obtained using other methods.

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