Search for Methanol Emission at 45 GHz in Galactic Sources

Details Search for Methanol Emission at 45 GHz in Galactic Sources Search for Methanol Emission at 45 GHz in Galactic Sources

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.2905a&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #29.05; Bulletin of the American Astronomical Society, Vol. 32, p.1445

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Scientific paper

Using the Haystack Observatory 37-m radio telescope we have undertaken a search for maser emission in the 20-3_1 rotational transition of methanol in the first torsionally excited state (/vt = 1) near 45 GHz. We examined seven galactic sources --- six strong emitters of Class II methanol maser lines and Orion KL, the only source where this line had been detected. We confirm (at a level of 2/sigma) the previous detection and report two new detections --- a reliable (4/sigma) detection in W3(OH) and a marginal (2/sigma) detection in NGC 6334I. Upper limits for other sources will be presented. Although we did not see obvious signatures of maser amplification in this line in any source, arguments in favor of weak masing in W3(OH) will be presented and the significance of this discussed. This project was partially supported by the NSF/REU grant AST-9820555.

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