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, SURVEYS, STARS: FORMATION, HII REGIONS, ISM: MOLECULES, RADIO LINES: ISM
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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URI:	http://hdl.handle.net/2289/1578
ISSN:	0035-8711
Alternative Location:	http://adsabs.harvard.edu/cgi-bin/bib_query?1996MNRAS.280..378E http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996MNRAS.280..378E&link_type=ARTICLE&db_key=AST
Copyright:	(1996) Royal Astronomical Society
Appears in Collections:	Research Papers (A&A)

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