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Title: A survey of the galactic plane for 6.7-GHz methanol masers - I. l=325 deg-335 deg b=-0.˚53-0.˚53
Authors: Ellingsen, S.P.
von Bibra, M.L.
McCulloch, P.M.
Norris, R.P.
Deshpande, A.A.
Phillips, C.J.
Keywords: MASERS,
Issue Date: May-1996
Publisher: Blackwell Publishing for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 1996, Vol.280, p378-396
Abstract: We report the results of the first complete survey of an area of the Galactic plane for maser emission from the 6.7-GHz 5_1--〉6_0 A^+ transition of CH_3OH. The survey covers a 10.6-deg^2 region of the Galactic plane in the longitude range 325 deg-335 deg 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 CH_3OH masers are not associated with IRAS sources, and that some are associated with sources that have colours differing from those of a typical ultracompact HII (UCHII) region. We estimate that the number of UCHII regions in the Galaxy is significantly more than suggested by IRAS-based estimates, possibly by more than a factor of 2.
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ISSN: 0035-8711
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Copyright: (1996) Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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