Two new methanol transitions in Orion A

Details Two new methanol transitions in Orion A Two new methanol transitions in Orion A

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..433j&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 433-435.

Astronomy and Astrophysics

Astronomy

8

Electron Transitions, Methyl Alcohol, Molecular Spectra, Nebulae, Radio Sources (Astronomy), Astronomical Spectroscopy, Brightness Temperature, Line Spectra

Scientific paper

Emission from the 11(1) - 10(2) (A-) and 5(0) - 4(1) (E) transitions of CH3OH at rest frequencies of 76,247.4 and 76,509.9 MHz, respectively, has been detected toward Orion A. The velocity widths of the two transitions are estimated to be approximately 3 km/s, which is consistent with other methanol lines in Orion. It is noted that the 117.5-kayser upper-state energy of the 11(1) - 10(2) (A-) transition is the highest yet reported for methanol in any source. The observed intensity is shown to be consistent with the 90-K thermal excitation model that seems to be appropriate for all other reported CH3OH lines in Orion A. Total column densities of 3 x 10 to the 16th per sq cm for the 11(1) - 10(2) (A-) transition and of 2 x 10 to the 16th per sq cm for the 5(0) - 4(1) (E) transition are calculated.

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