Water Masers Toward Ultracompact HII Regions

Details Water Masers Toward Ultracompact HII Regions Water Masers Toward Ultracompact HII Regions

2005-07-01

arxiv.org/abs/astro-ph/0507039v1

Astron.J.130:711-720,2005

Astronomy and Astrophysics

Astrophysics

21 pages, 5 figures. Accepted by Astronomical Journal

Scientific paper

10.1086/431546

We present a survey in the 6_{16}-5_{23} rotational water transition toward 33 galactic ultracompact HII regions. Maser emission is detected toward 18 of these sources; two are new detections. High quality spectra are provided for all 18 sources. We discuss the detection rate of this survey and the correlation of various maser properties with other physical parameters. In addition, we report wide-bandwidth (316 km/s), moderate-resolution (~ 3'') water maser observations of the HH80-81 region. We report the first detection of water maser emission at the approximate velocity of the molecular core. This emission is coincident with the extreme tip of the thermal jet, and well-removed from the much stronger and well-known maser emission at the position of VLA-3.

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