Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..480z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 480-482.
Astronomy and Astrophysics
Astrophysics
4
Interstellar Masers, Methyl Alcohol, Organic Lasers, Radiative Transfer, Absorption Spectra, H Ii Regions, Histories, Molecular Clouds
Scientific paper
The formation conditions for A-type methanol masers are discussed. The correlation between A-type masers and external radiation fields is determined, with emphasis on the energy levels of A-type methanol and brightness temperature. Radiative transfer equations and statistical equilibrium are solved using a large velocity gradient model and the escape probability model. It is demonstrated that the 9(2)-10(1)A+ emission in W3(OH) and 7(0)-6(1)A in SgrB2 are masers, as discovered previously. The formation of the first type of masers requires pumping from an external radiation field, while the second type might be excited in the absence of an external radiation field. It is also pointed out that according to calculations there are A-type maser series similar to E-type methanol maser series of J2-J1E.
Lou Guo-Fang
Zeng Qiang
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