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2000MNRAS.313..599C - Mon. Not. R. Astron. Soc., 313, 599-616 (2000/April-2)
Methanol masers at 107.0 and 156.6GHz.
CASWELL J.L., YI J., BOOTH R.S. and CRAGG D.M.
Abstract (from CDS):
We find that masers are rare at the 156.6-GHz transition. Two new detections increase the total now known to four. Each 156.6-GHz maser is substantially weaker than its corresponding 107.0-GHz maser. Despite the scarcity of masers, our 156.6-GHz spectra at most observed sites show emission, but apparently of a quasi-thermal variety; it is usually accompanied by somewhat weaker thermal emission at 107.0GHz, and the intensity ratio of the transitions allows us to begin exploration of the physical characteristics of the small molecular clouds (diameter less than 60mpc) at these sites. The thermal emission thus provides estimates of the environmental conditions that are needed to support strong masing from spots that are apparently embedded within these clouds.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): masers - stars: formation - Hii regions - ISM: molecules - radio lines: ISM
Nomenclature: Table 1: Caswell CH3OH LLL.lll+BB.bbb N=26 new.
Simbad objects: 92
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