Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..849w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 849-859.
Astronomy and Astrophysics
Astrophysics
15
Interstellar Masers, Polarized Electromagnetic Radiation, Radiative Transfer, Angular Momentum, Anisotropic Media, Electromagnetic Interactions, Electron Transitions, Linear Polarization, Molecular Energy Levels, Plane Waves, Size Determination
Scientific paper
Equations are obtained that describe the transfer of the linearly polarized radiation that occurs naturally in two and three-dimensional astronomical masers. The basic formulation for the calculations is first given in terms of the density matrix for the molecular states. The treatment differs from that of Goldreich, Keeley, and Kwan (1973) in its use of 'dipole' basis states rather than the usual magnetic states, and by considering a number of intersecting maser rays. The case of two unpolarized beams intersecting at right angles is considered illustratively, and the more general case of any number in a plane is solved. Finally, the symmetries of disks, spheres, and shells are shown to cause considerable simplification in the transfer equations. The J = 2 to 1 case is used to show the generality of the results.
Watson William D.
Western L. R.
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