The distribution of the H134 alpha recombination line in W33

Details The distribution of the H134 alpha recombination line in W33 The distribution of the H134 alpha recombination line in W33

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apl....16...29g&link_type=abstract

Astrophysical Letters, vol. 16, no. 1, 1975, p. 29-33.

Astronomy and Astrophysics

Astronomy

14

H Alpha Line, Hydrogen Recombinations, Nebulae, Radio Sources (Astronomy), Astronomical Maps, Astronomical Models, Continuum Mechanics, Electron Energy, Emission Spectra, H Ii Regions, Ionized Gases, Line Spectra, Optical Thickness

Scientific paper

The H II region W33 has been mapped in the H134-alpha line (2702.8 MHz) with an angular resolution of 4.8 arc min. The line emission has velocity peaks near 32 and 58 km/sec, and these occur over an appreciable part of the nebula. The observations are interpreted in terms of a source expanding at a velocity of about 15 km/sec. The clouds containing OH and H2CO are believed to surround the nebula and to be pushed ahead of the expanding ionized shell. The electron temperatures derived with the assumption of an optically thin plasma at LTE shows values of 4000-5000 K and 7000-8000 K in two extended regions, with higher values in a small region near the main continuum, high emission measure, peak.

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