Observations of H53-alpha emission from bright galaxies

Astronomy and Astrophysics – Astronomy

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Brightness Distribution, Galactic Radio Waves, H Alpha Line, H Ii Regions, Millimeter Waves, Spiral Galaxies, Emission Spectra, Far Infrared Radiation, Recombination Reactions

Scientific paper

The hydrogen recombination lines H40-alpha and H53-alpha were searched for in three bright spiral galaxies, and H53-alpha was detected in NGC2146 and, possibly, in NGC1068. The strength of the detected lines, when compared with radio continuum and far-infrared data, implies that they cannot be produced solely by spontaneous emission but that about three-quarters, or more, of the line photons are stimulated by continuum radiation. Model H II regions are presented which satisfy constraints imposed by the large stimulated H53-alpha fraction, and by the radio continuum and line fluxes. These H II regions must be small, dense, and numerous. These results contrast with the suggestion that the H53-alpha radiation from M82 is dominated by spontaneous emission; a conclusion which is still supported by the observed H40-alpha/H53 alpha line ratio.

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