VLA Observations of the 8-GHZ Rotationally Excited OH Lines Toward W3/OH

Details VLA Observations of the 8-GHZ Rotationally Excited OH Lines Toward W3/OH VLA Observations of the 8-GHZ Rotationally Excited OH Lines Toward W3/OH

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..552b&link_type=abstract

Astronomy and Astrophysics, Vol.271, NO. 2/APR, P. 552, 1993

Astronomy and Astrophysics

Astrophysics

26

H Ii Regions, Masers, Excitation, Oh, Star Formation, W3(Oh)

Scientific paper

The 2π1/2 and J=3/2 and J = 5/2 main lines of OH and the continuum, at 8 GHz, have been mapped toward W3(OH) with an angular resolution of 0.3" and a resolution of 0.45-0.47 km s-1. The continuum maps produced in conjunction with each spectral line map were combined. In addition to the four previously found continuum features, we have tentatively detected a new weak, unresolved source. This coincides with a weak 1.7 GHz OH maser, about 7" NE of W3(OH). The 2π1/2, J=3/2, F=2-2 and F=1-1 main lines at 7820 and 7762 MHz, respectively, are found in absorption toward the western part of W3(OH), and both show a clumpy structure. There is a weak emission feature at 7820 MHz, about 0.5" NE of the northern absorption clump. The 2π1/2, J=5/2, F = 2-2 main line, at 8136 MHz, shows only absorption, while the F=3-3 main line, at 8190 MHz, is present in weak emission; this emission overlaps the 7820 MHz emission region. The flux density of the F=3-3 line has been redetermined with the 100-m telescope; this line is not polarized, and there has been no significant change in properties since 1988. There are deviations from LTE excitation for these lines; comparisons with OH excitation models are made.

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