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A survey of the Galactic plane for 6.7-GHz methanol masers .1. l=325 degrees-335 degrees; b=-0 degrees.53-0 degrees.53
journal contribution
posted on 2023-05-16, 07:36 authored by Simon EllingsenSimon Ellingsen, Von Bibra, ML, Peter McCullochPeter McCulloch, Norris, RP, Deshpande, AA, Phillips, CJWe report the results of the first complete survey of an area of the Galactic plane for maser emission from the 6.7-GHz 51 → 60 A+ transition of CH3OH. The survey covers a 10.6-deg2 region of the Galactic plane in the longitude range 325°-335° and latitude range -0°.53-0°.53. The survey is sensitive to masers with a peak flux density greater than ∼ 2.6 Jy. The weakest maser detected has a peak flux density of 2.3 Jy, and the strongest a peak flux density of 425 Jy. We detected a total of 50 distinct masers, 26 of which are new detections. We show that many 6.7-GHz CH3OH masers are not associated with IRAS sources, and that some are associated with sources that have colours differing from those of a typical ultracompact H II (UCH II) region. We estimate that the number of UCH II regions in the Galaxy is significantly more than suggested by IRAS-based estimates, possibly by more than a factor of 2.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
280Pagination
378-396ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Blackwell Publishing LtdPlace of publication
LondonRepository Status
- Restricted