Detection of new sources of 4765-MHz OH masing

Details Detection of new sources of 4765-MHz OH masing Detection of new sources of 4765-MHz OH masing

2001-05-16

arxiv.org/abs/astro-ph/0105264v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, in IAU 206 conference proceedings

Scientific paper

We have used the Australia Telescope Compact Array (ATCA) to make a sensitive search for maser emission from the 4765-MHz transition of OH towards a sample of 55 star formation regions. Maser emission with peak flux densities in excess of 100 mJy were detected in 14 sites, with 10 of these being new discoveries. Unlike the ground-state OH transitions the 4765-MHz transition is not predicted to be circularly polarised and none of the masers observed have detectable levels of linear, or circular polarisation. Combining our results with those of previous high resolution observations of other OH transitions we are able to investigate various theoretical models for the pumping of OH masers.

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