Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..585p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 585-592. Nobeyama Radio Observato
Astronomy and Astrophysics
Astronomy
15
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.
Brand Peter W. J. L.
Moore Justin Tatch
Mountain Charles M.
Nakai Noriyuki
Puxley Phil J.
No associations
LandOfFree
Observations of H53-alpha emission from bright galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observations of H53-alpha emission from bright galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of H53-alpha emission from bright galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1318233