On mapping the magnetic field direction in molecular clouds by polarization measurements

Details On mapping the magnetic field direction in molecular clouds by polarization measurements On mapping the magnetic field direction in molecular clouds by polarization measurements

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243l..75g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 15, 1981, p. L75-L78.

Astronomy and Astrophysics

Astronomy

60

Interstellar Magnetic Fields, Line Spectra, Linear Polarization, Molecular Clouds, Radiative Transfer, Radio Spectra, Astronomical Maps, Interstellar Radiation, Polarimetry, Radio Astronomy, Zeeman Effect

Scientific paper

It is predicted that interstellar radio-frequency lines possess a few percent linear polarization, provided that (1) the radiative transition rate is at least comparable to the collision rate, (2) the optical depth is moderate and anisotropic, and (3) the number of extrema of the velocity component along the line of sight through the source is small. If the Zeeman splitting exceeds both the collisional frequency and the radiative transition rate, then the polarization is aligned either perpendicular to or parallel to the projection of the magnetic field on the plane of the sky.

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