The detection of a new, nonmasing transition of methanol at 28.3 GHz

Details The detection of a new, nonmasing transition of methanol at 28.3 GHz The detection of a new, nonmasing transition of methanol at 28.3 GHz

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l..43s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 1, p. L43-L46.

Other

6

Electron Transitions, Emission Spectra, Interstellar Masers, Interstellar Matter, Methyl Alcohol, Absorption Spectra, Astronomical Spectroscopy, Far Infrared Radiation, Radio Telescopes

Scientific paper

A search for the 4(0)-3(1)E methanol line at 28.3 GHz was undertaken with the 43 m radio telescope at Green Bank. From a sample of 63 sources with methanol emission detected in other transitions, only six were detected in emission for this line: Orion-KL, Sgr A-A, A-F, A-G, Sgr B2, W51 e1/e2; and one W3(OH), in absorption. The detected lines are weak and do not show maser properties. The detection of lines in emission is inconsistent with the far-infrared excitation model through the first torsionally excited state but does agree with the collisional excitations/spontaneous decay model. However, the far-infrared excitation model can be applied to the absorption line detected for the Class II source W3(OH).

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