Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-01-05
Astronomy and Astrophysics
Astrophysics
19 pages including 4 figures, using LaTeX formatted with mn.sty, accepted for publication in MNRAS
Scientific paper
We report the results of the first complete survey of an area of the Galactic Plane for maser emission from the 6.7-GHz transition of methanol. The survey covers a 10.6-square-degree region of the Galactic Plane in the longitude range 325-335 degrees and latitude range -0.53-0.53 degrees. The survey is sensitive to masers with a peak flux density greater than approximately 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 methanol masers are not associated with IRAS sources, and that some are associated with sources that have colours differing from those of a typical ultra-compact HII region (UCHII). 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 two.
Deshpande Akshay
Ellingsen Simon P.
McCulloch Peter M.
Norris Ray P.
Phillips Charles J.
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