Interferometric Images of the 36 GHz Methanol Masers in Star Forming Regions

Details Interferometric Images of the 36 GHz Methanol Masers in Star Forming Regions Interferometric Images of the 36 GHz Methanol Masers in Star Forming Regions

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934919s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #349.19

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Scientific paper

Class I methanol masers are usually located in shocked environments near star forming regions. The EVLA upgrade has for the first time permitted interferometric observations of the 36 GHz Class I methanol transition. We report on images of the bright 36 GHz masers in 12 star-forming regions. Some sources show strong correlations between the locations of the 36 and 44 GHz Class I masers, while other sources show no correlation at all, suggesting that the ensemble of sources is representative of a large variety of physical conditions. For example, in the source G10.6-0.4 the 36 GHz masers were found to be located along a ridge of enhanced methanol density interacting with an outflow. In Sgr B2M, the 36 GHz masers trace an organized structure offset to the west of the main complex of ultracompact HII regions and Class II methanol masers. It will be important to analyze these results in the context of the thermal molecular environment of the masers in order to verify various models which describe the dependency on temperature, density, and column density of the Class I methanol masers. This work is made possible thanks to support from the National Science Foundation Research Experience for Undergraduates program.

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