A Possible Pumping Mechanism for Interstellar Class II 107 GHz Methanol Masers

Details A Possible Pumping Mechanism for Interstellar Class II 107 GHz Methanol Masers A Possible Pumping Mechanism for Interstellar Class II 107 GHz Methanol Masers

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chjaa...2...51l&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 2, p. 51-58 (2002)

Astronomy and Astrophysics

Astrophysics

H Ii Regions, Masers, Radiation Mechanisms: Non-Thermal, Ism: Molecules, Line: Formation

Scientific paper

It is recognized that the interstellar methanol- 107 GHz masers and OH-4.765 GHz masers towards Class II sources are associated with each other and coexist towards ultracompact HII regions. Therefore we suggest a new pumping mechanism -- methanol masers without population inversion. It can explain the formation of 107 GHz methanol masers, with the 4.765 GHz OH masers acting as a driving coherent microwave field. It is argued that this mechanism is compatible with the astronomical conditions.

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