Generation of Interstellar Class II 72-81A+ and 72-81A- Methanol Masers

Details Generation of Interstellar Class II 72-81A+ and 72-81A- Methanol Masers Generation of Interstellar Class II 72-81A+ and 72-81A- Methanol Masers

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007chjaa...7..803l&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Volume 7, Issue 6, pp. 803-808 (2007).

Astronomy and Astrophysics

Astrophysics

Scientific paper

New methanol maser lines at 72→63A-(86.6 GHz) and 72→63A+(86.9 GHz) together with two candidate methanol maser lines at 72→81A-(80.99 GHz) and 72→81A+(111.29 GHz) have been detected in W3(OH). We use a pumping mechanism, i.e., methanol masers without population inversion, to explain the formation of weak methanol masers of 72→81A+ and 72→81A-. We explain well why the line-shape of the transition 72→81A+ is not typical. A similar argument can be applied to the Λ-type level system 72A-, 63A- and 81A-, as well as to the 72→81A- 80.99 GHz masers.

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