VLA hydrogen and helium 76-alpha line observations of Sagittarius B2

Details VLA hydrogen and helium 76-alpha line observations of Sagittarius B2 VLA hydrogen and helium 76-alpha line observations of Sagittarius B2

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175..219r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 219-230. ZWO-supported research.

Astronomy and Astrophysics

Astronomy

40

Abundance, H Alpha Line, Line Spectra, Molecular Clouds, Radio Astronomy, Angular Resolution, Continuous Radiation, H Ii Regions, Helium, Hydrogen, Nebulae, Optical Thickness

Scientific paper

The H II region complex Sgr B2 (G0.7-0.0) has been mapped with the VLA with an angular resolution of 3.8 x 3.4 arcsec and a velocity resolution of 8 km/s. The distribution of the H76-alpha and He76-alpha line emission has been determined over the 11 continuum components of this complex. The effects of an appreciable continuum optical depth near the compact components in G0.7S are apparent in a decrease in the line to continuum ratio of the hydrogen line. The quantity y(+) shows an increase with distance from the center of the compact components. This trend is caused by two effects: (1) near the most compact components in G0.7S, the helium-ionized zone is smaller than that of hydrogen leading to an apparently weak helium line, and (2) in the surrounding components, the helium and hydrogen ionized volumes are comparable. In the direction of G0.7N, at least three velocity systems are observed, two of which have counterparts in the surrounding molecular cloud.

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