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A water maser survey towards the Galactic Centre
journal contribution
posted on 2023-05-17, 05:25 authored by Caswell, JL, Breen, SL, Simon EllingsenSimon EllingsenWe have used the Australia Telescope Compact Array to survey the Galactic Centre for the 22-GHz transition of water. The survey provides an unbiased search for water masers within a 0.5 deg2 region about the Centre, and the small synthesized beam directly yields positions to arcsecond accuracy. The detected sources were re-observed 4 months later and showed considerable changes in their spectra, with two sources found in the follow-up that were not seen in the original survey, yielding a total of 27 maser detections. Comparison with methanol and OH surveys shows that, at current sensitivity levels, water masers greatly outnumber the other species. 12 of our maser detections had previously been reported, discovered during searches towards interesting targets in the survey area. Themajority of our sources are quite weak, consistent with excitation by young massive stars mostly near the Galactic Centre. Our spectra reveal high-velocity outflows at one-quarter of the water maser sites, a statistic similar to sites in the remainder of the Galaxy.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
410Pagination
1283-1294ISSN
1365-2966Department/School
School of Natural SciencesPublisher
Wiley-Blackwell Publishing LtdPlace of publication
United KingdomRights statement
The definitive published version is available online at: http://onlinelibrary.wiley.com/Repository Status
- Restricted