Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345..274d&link_type=abstract
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 274-275 (SEE N85-15539 06-90)
Astronomy and Astrophysics
Astronomy
Clouds, Diatomic Molecules, Emission Spectra, Interstellar Gas, Interstellar Radiation, Linear Polarization, Radio Frequencies, Line Spectra, Mapping, Radiative Transfer, Radio Astronomy, Zeeman Effect
Scientific paper
Two level calculations by others for the linear polarizations expected for molecular emission lines from interstellar clouds are extended by considering a number of coupled rotational states of a diatomic molecule. Higher transitions commonly have strengths comparable to that of the J = 1 → 0 transition so that depolarization due to coupling between the various J-states might be expected to reduce the predicted linear polarization. The significance of the null observational results obtained recently by Wannier, Scoville and Barvainis is assessed. The inclusion of additional states tends to decrease the maximum polarizations, though the calculated polarization is increased under conditions for which "superthermal" excitation occurs.
Deguchi Shigeki
Watson William D.
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