H53-alpha emission from M82

Details H53-alpha emission from M82 H53-alpha emission from M82

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..521p&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 521-523 (SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

Emission Spectra, Galaxies, Hydrogen Recombinations, Star Formation, Alpha Particles, Energy Spectra, Gas Ionization, Line Spectra, Photoionization

Scientific paper

The data concerning the first detection of H53 alpha emission from another galaxy is reported. At the frequency of this transition (43 GHz), spontaneous emission dominates and dust extinction can be ignored. The inferred photoionization rate is a factor of 5 larger than estimates based on large aperture Br alpha observations, due to significant dust attenuation at 4 microns. The implication of this high value of the ionization rate, for the allowed mass range of stars, is considered.

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