Molecular alignment and radiative transport

Details Molecular alignment and radiative transport Molecular alignment and radiative transport

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202...58l&link_type=abstract

Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 58-75.

Astronomy and Astrophysics

Astrophysics

14

Interstellar Magnetic Fields, Interstellar Masers, Molecular Rotation, Radiative Transfer, Anisotropic Media, Boltzmann Transport Equation, Molecular Collisions, Photon Density, Polarized Radiation, Population Theory, Radiant Flux Density, Stokes Law, Zeeman Effect

Scientific paper

Methods and examples are given for the calculation of the unequal populations among magnetic sublevels of interstellar molecules subject to anisotropic and polarized radiation and to elastic and inelastic collisions among the rotational levels. Though as yet unobserved, the most likely source of such radiation that thereby aligns the molecules, such as HCN, is an adjacent layer in a slab or cylinder region that emits as a maser parallel to the layer. The molecular alignment is shown to affect the opacity, source function, and emergent flux, for example, in the hyperfine-split 3-mm HCN components. Polarization properties of masers are briefly discussed in this connection by means of transport equations for the normalized Stokes parameters. Propagation from maser regions into absorber regions can greatly change the polarization.

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