VLA observations of highly excited OH absorption toward W3(OH).

Details VLA observations of highly excited OH absorption toward W3(OH). VLA observations of highly excited OH absorption toward W3(OH).

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...298..905b&link_type=abstract

Astronomy and Astrophysics, v.298, p.905

Astronomy and Astrophysics

Astrophysics

13

Hii Regions, Masers, Star Formation, Ism: W3(Oh), Radio Continuum: Ism, Radio Lines: Ism

Scientific paper

We have used the Very Large Array (VLA) to map the two main hyperfine lines of the highly excited ^2PI_3/2_, J=9/2 level of OH toward the ultracompact HII region W3(OH) with high angular (0.33") and spectral (0.62km/s) resolution. These transitions have frequencies near 23.8GHz and, with energies around 500K above the ground-state, probe hot gas in the molecular environment of the ultracompact HII region. Both lines are seen in absorption against the western half of the HII region with an angular extent and a clumpy structure similar to that of OH transitions in the ^2PI_1/2_ energy ladder, which have been previously observed with the VLA at comparable resolution. In contrast to the latter, we find for most of the area over which the OH lines are detected that the excitation of the J=9/2 level apparently does not show strong deviations from LTE, except for a compact region near its northeastern boundary, where we tentatively detect weak maser emission in the F=4-4 transition. We have also produced a 23.8GHz continuum map of W3(OH) that is in good agreement with previous VLA maps at similar frequencies.

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