High-resolution observations of the W33 complex at 2.8, 6, 18 and 21 CM

Details High-resolution observations of the W33 complex at 2.8, 6, 18 and 21 CM High-resolution observations of the W33 complex at 2.8, 6, 18 and 21 CM

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....65..307g&link_type=abstract

Astronomy and Astrophysics, vol. 65, no. 3, May 1978, p. 307-312. Research supported by the Nederlandse Organisatie voor Zuiver

Astronomy and Astrophysics

Astronomy

25

Astronomical Maps, High Resolution, Hydroxyl Emission, Line Spectra, Radio Astronomy, Centimeter Waves, Decimeter Waves, Formaldehyde, H Alpha Line, H Ii Regions, Hydrogen Ions, Interferometers, Radio Galaxies, Radio Telescopes

Scientific paper

The H II-region complex W33 has been mapped in the continuum at three wavelengths: at 2.8 cm, 6 cm and 21 cm. The region consists of a number of weak discrete features and one strong component (G12.80 0.20). These features are superimposed on a broad background. The H109 alpha recombination line has been observed at four positions, and at three positions the profile has two components. The 6 cm H2CO line was also observed at three positions within W33, and at one position nearby. These data are consistent with either a chance superposition of two H II regions at different distance or with a single H II region with an expansion velocity near 13 km/s. The present observations, especially those of the H2CO absorption line, favour the first alternative. A new determination of the positions of the OH Type I emission sources W33A and W33B has been made with an accuracy of 2 sec.

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