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Methanol masers and their environment at high resolution
journal contribution
posted on 2023-05-16, 11:06 authored by Phillips, CJ, Norris, RP, Simon EllingsenSimon Ellingsen, Peter McCullochPeter McCullochWe have used the Australia Telescope Compact Array (ATCA) to make high-resolution images of the 6.7-GHz 51 → 60A+ maser transition of methanol towards 33 sources in the Galactic plane. Including the results from 12 methanol sources in the literature, we find that 17 out of 45 sources have curved or linear morphology. Most of the 17 have a velocity gradient along the line, which is consistent with masers lying in an edge-on circumstellar disc surrounding a massive star. We also made simultaneous continuum observations of the sources at 8.6 GHz, in order to image any associated H II region. 25 of the sources are associated with an ultracompact H II region, with a detection limit of ∼0.5 mJy beam-1. We argue that the methanol sources without an associated H II region represent less massive embedded stars, not an earlier stage in the lifetime of the star, as previously suggested.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
300Issue
4Pagination
1131-1157ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Royal Astronomical SocietyPlace of publication
LondonRepository Status
- Restricted