Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89..150v&link_type=abstract
Astronomy and Astrophysics, vol. 89, no. 1-2, Sept. 1980, p. 150-157. Research supported by the Nederlandse Organisatie voor Zu
Astronomy and Astrophysics
Astrophysics
34
Astronomical Spectroscopy, H Ii Regions, Line Spectra, Radio Spectroscopy, Synthetic Apertures, Emission Spectra, H Alpha Line, Hydrogen Ions, Radio Telescopes
Scientific paper
By the use of the Westerbork Synthesis Radio Telescope, the H 109 alpha line in the sources W 49 A and W 51 A has been observed. The measured line-to-continuum ratios show a marked variation from one compact component to the other. In one component in W 51 A the observed ratio is significantly greater than the expected LTE value; the most likely explanation is stimulated emission. In both sources the more compact components have low line-to-continuum ratios. This effect can be interpreted in terms of pressure broadening at electron densities in excess of 100,000/cu cm.
Goss William Miller
Harten R. H.
Schwarz Ulrich J.
Shaver Peter A.
van Gorkom Jacqueline H.
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