Other
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..203c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 1, p. 203-208.
Other
94
Interstellar Masers, Maser Pumping, Methyl Alcohol, Astronomical Models, Molecular Collisions, Molecular Excitation
Scientific paper
A simple model is proposed to study class I and class II methanol masers. The class I masers which are caused by collisional excitation followed by spontaneous radiative decay appear in low-frequency transitions where the upper state is strongly favored by large Einstein A coefficients. The class II masers appear when a source of continuum radiation is warmer than the gas kinetic temperature. The high-frequency transitions selectively populate or depopulate levels by preferential absorption of submillimeter photons. This radiative pumping causes masing in transitions which exhibit absoption in the class I case, and vice versa. A simple model is described which accounts for all the diverse methanol masers and explains the nature of lines which are seen as masing in some sources and as absorption in others.
Brown Ronald D.
Cragg Dinah M.
Godfrey Peter D.
Johns Kevin P.
No associations
LandOfFree
Pumping the interstellar methanol masers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pumping the interstellar methanol masers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pumping the interstellar methanol masers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1554854