Interstellar H300-alpha line radiation

Details Interstellar H300-alpha line radiation Interstellar H300-alpha line radiation

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..805c&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 6, Dec. 1977, p. 805-808.

Astronomy and Astrophysics

Astrophysics

15

H Alpha Line, Interstellar Radiation, Radiative Recombination, Charge Exchange, Galactic Nuclei, Gas Ionization, H Ii Regions, Interstellar Matter, Line Spectra, Radial Velocity, Rarefied Gases, Recombination Reactions, Stimulated Emission

Scientific paper

An H300-alpha recombination line (242 MHz) has been detected in the direction of the galactic center. It is probably due to stimulated emission from very extended low-density H II regions, whose presence in the line of sight to the galactic center has recently been confirmed by detection of the H200-beta line. Upper limits on the line intensity towards Cas A imply for the cold H I clouds in that direction either a very low hydrogen ionization rate (less than 2 by 10 to the -17th power per sec) or a very high molecular concentration.

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