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25th of February 2020
ATCA OH Maser observations for the SPLASH Survey
by Qiao et al.
Ground-state OH masers are relatively common in the vicinity of high-mass star formation (HMSF), the circumstellar envelopes of evolved giant and supergiant stars, and the interaction regions of supernova remnants (SNRs) and their surrounding molecular clouds. Qiao et al. present high spatial resolution ATCA observations of ground-state OH masers identified in the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH). Comparison between these 362 maser sites with information presented in the literature allowed categorizations of 238 sites (66%) as evolved star sites, 63 (17%) as star formation, 8 (2%) as supernova remnants and 53 (15%) as unknown maser sites (15%). Qiao et al. compared star formation OH maser sites in the SPLASH survey region to 6.7 GHz methanol maser sites from the Parkes Methanol Multi-Beam (MMB) survey and 22 GHz water maser sites from the Mopra HOPS survey. For OH maser sites, the largest overlap is with methanol maser sites, with 89/118 (75%) OH maser sites having associated methanol emission. Additionally 55 OH maser sites (47%) show 22 GHz water masers. Water masers also have the largest overlap with methanol masers, with 101/207 (49%) water masers associated with methanol maser sites. A total of 173/318 (54%) methanol maser sites are not associated with either OH or water masers. It was found that 80/118 (68%) of OH masers are associated with water masers. More details are given in the paper to be published in Monthly Notices of the Royal Astronomical Society.

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