Linear polarization of millimeter-wave emission lines in clouds without large velocity gradients

Details Linear polarization of millimeter-wave emission lines in clouds without large velocity gradients Linear polarization of millimeter-wave emission lines in clouds without large velocity gradients

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..304l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 1, 1988, p. 304-314.

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11

Emission Spectra, Interstellar Magnetic Fields, Line Spectra, Linear Polarization, Millimeter Waves, Molecular Clouds, Computational Astrophysics, Fine Structure, Formyl Ions, Molecular Ions, Velocity Distribution

Scientific paper

An equivalent model for linearly polarized emission of optically thin lines in dark clouds without embedded infrared sources which discards the large velocity gradient assumption is presented. Molecular clouds generally consist of a high-density core surrounded by an envelope with density decreasing with distance from the core. If the density contrast between the core and the outer portion of the envelope is large, the excitation temperature can drop rapidly with radius. Gradients in the excitation temperature through the cloud can be expected to produce an anisotropic radiation field away from the cloud center. If the excitation temperature is large enough, this anisotropy may produce significant differences in the population of different Zeeman sublevels of a given rotational level, resulting in the polarization of emergent radiation. Observations of (H-13)CO(+) and HCO(+) in four dark clouds show no linear polarizations. The significance of the achieved upper limits is discussed.

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