Observations of methanol in the dark molecular clouds as a method for determining collisional constants

Details Observations of methanol in the dark molecular clouds as a method for determining collisional constants Observations of methanol in the dark molecular clouds as a method for determining collisional constants

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990kfnt....6....3s&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 6, May-June 1990, p. 3-7. In Russian.

Physics

1

Brightness Temperature, Collision Parameters, Methyl Alcohol, Molecular Clouds, Monte Carlo Method, Quantum Numbers, Galactic Radio Waves, Interstellar Masers

Scientific paper

The dark molecular clouds TMS-1 and L183 are modeled using the Monte Carlo technique and the brightness temperatures of E-methanol lines 2(0)-3(-1), 2(1)-3(0), 2(1)-1(-1), 1(0)-0(0), and 2(0)-1(0). The observational data are explained with the assumption that the kinetic temperature increases in the direction toward the periphery of the cloud. It is found that the fractional abundance of E-methanol is in the range between 10 to the -8th and 10 to the -9th and that the collisional efficiency constant, sigma(0) is in the range (10 exp -11 to 10 exp -9.5) cu cm x (K exp -0.5)/s. Also, it is shown that the observation of the 0(0)-1(-1), 2(0)-2(-1), 3(0)-3(-1), 1(1)-1(0), 2(1)-2(0), 2(2)-1(1), 3(2)-2(1) E-methanol lines would make it possible to define the collisional selection rule by the difference of the k quantum numbers.

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