Class I Methanol Masers in the DR21 Star Forming Complex

Details Class I Methanol Masers in the DR21 Star Forming Complex Class I Methanol Masers in the DR21 Star Forming Complex

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3018h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #30.18; 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. Several Class I masers, at frequencies of 36 and 44 GHz, were found in a large scale survey of several molecular clouds with the Haystack 37-m radio telescope. One of the newly discovered masers (DR21N), situated 3’ north of the strong maser source in DR21OH, was imaged with the VLA. The maser positions were compared with multi-band images from the Spitzer Space Telescope and there appears to be a spatial correlation between the masers and an infrared source, which shows strong emission in the 8μ band. The relationship between the masers and the infrared emission in the entire DR21 complex will be examined.
In addition, further examination of the 44 and 36 GHz maser lines and the implications of the line ratios for the evolutionary state of the YSO will be presented. There are indications that sources in which the 36 GHz maser emission is enhanced are at an earlier evolutionary stage than those sources in which the 36 GHz maser is weak or non-existent. These results can be used to put constraints on the maser excitation models.
The REU program at MIT Haystack Observatory is funded by the National Science Foundation.

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