Water Masers Toward Ultracompact HII Regions

Abstract

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.

arXiv comment21 pages, 5 figures. Accepted by Astronomical Journal

References in corpus (7)

• Massive Stars: Their Environment and Formation
• CH3OH and H2O masers in high-mass star-forming regions
• Long-term study of water masers associated with Young Stellar Objects. II: Analysis
• A survey for water maser emission towards planetary nebulae. New detection in IRAS 17347-3139
• VLA and BIMA observations toward the exciting source of the massive HH~80-81 outflow
• The structure of Onsala 1 star forming region
• Water masers in dusty environments

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