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High-velocity H2O maser emission from the post-asymptotic-giant-branch star OH 009.1-04
journal contribution
posted on 2023-05-16, 23:53 authored by Walsh, AJ, Breen, SL, Bains, I, Vlemmings, WHTObservations of H2O masers towards the post-asymptotic-giant-branch star and water fountain source OH 009.1−0.4 were made as part of The H2O southern galactic Plane Survey, with the Mopra radiotelescope. Together with followup observations using the Australia Telescope Compact Array (ATCA), we have identified H2O maser emission over a velocity spread of nearly 400 km s −1 (− 109 to +289 km s−1). This velocity spread appears to be the largest of any known maser source in our Galaxy. High-resolution observations with the ATCA indicate that the maser emission is confined to a region 0.3 × 0.3 arcsec and shows weak evidence for a separation of the red- and blueshifted maser spots. We are unable to determine if the water fountain is projected along the line of sight, or is inclined, but either way OH 009.1−0.4 is an interesting source, worthy of followup observations.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
394Pagination
L70-L73ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Wiley-Blackwell Publishing IncPlace of publication
Malden, USARights statement
The definitive published version is available online at: http://interscience.wiley.comRepository Status
- Restricted