Short-term Variations in the Class I Methanol Maser Line at 44 GHz

Details Short-term Variations in the Class I Methanol Maser Line at 44 GHz Short-term Variations in the Class I Methanol Maser Line at 44 GHz

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3019p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #30.19; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Class I methanol masers are found near regions of young star formation and are thought to be collisionally excited. They are usually found to be situated in molecular outflows. Some indication of long term variability has been reported previously. In this paper we will present evidence for variations in the intensity of the Class I methanol masers at 44 GHz on timescales of a few hours or less. A serendipitous observation by Strelnitski et al. with the ARO 12-m telescope (see Strelnitski et al at this meeting) indicated the possibility of short time-scale variations in the Class I 147 GHz transition of methanol toward DR21OH and DR21N. An examination of data from the Haystack 37-m telescope taken over a 7-day period in January 2006 appeared to confirm these variations. Follow-up observations with the 37-m telescope of several maser sources in the DR21 star forming complex, the W75N complex and OMC-2 were performed in October 2006. Evidence of variation on timescales of a few hours or less was found. These results will be presented. Implications of these new results for the physical conditions in the maser regions and the excitation mechanisms will also be presented.
Undergraduate research at MIT Haystack Observatory is supported by a grant from the National Science Foundation.

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