Search for class I methanol maser emission in various types of objects in the interstellar medium |
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| Authors: | I D Litovchenko A V Alakoz I E Val’tts G M Larionov |
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| Institution: | 1.Astro Space Center, Lebedev Physical Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Observations of various types of objects in the northern sky were obtained at 44 GHz in the 70-61
A
+ methanol line on the 20-m Onsala radio telescope (Sweden), in order to search for Class I methanol maser emission in the
interstellar medium: regions of formation of high-mass stars, dust rings around HII regions, and protostellar candidates associated
with powerful molecular outflows and Galactic HII regions. Seven new Class Imethanolmasers have been discovered toward regions
of formation of highmass stars, and the existence of two previously observed masers confirmed. The following conclusions are
drawn: (1) neither the association of a bipolar outflow manifest in the wings of CO lines with a highmass protostellar object
(HMPO) nor the presence of thermal emission in lines of complex molecules are sufficient conditions for the detection of Class
I methanol emission; no association with HMPOs radiating at 44 GHz was found for EGOs (a new class of object tracing bipolar
outflows); (2) the existence of H2O masers and Class II methanol masers in the region of aHMPOenhances the probability of detecting Class I methanol emission
toward the HMPO; Class II methanol masers with stronger line fluxes are associated with Class I methanol masers. |
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