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2000MNRAS.312..103C - Mon. Not. R. Astron. Soc., 312, 103-115 (2000/February-2)
Polarimetry of young stellar objects - III. Circular polarimetry of OMC-1.
CHRYSOSTOMOU A., GLEDHILL T.M., MENARD F., HOUGH J.H., TAMURA M. and BAILEY J.
Abstract (from CDS):
We demonstrate a correlation between these patches of high circular polarization and regions of enhanced linear polarization, and argue that these observations are best explained using a model that incorporates scattering of radiation off oblate grains, which have been aligned by the local magnetic field. Modelling of the ellipticity (the ratio of circular to linear polarization) suggests that the grains are composed of silicate and/or organic refractory material, and that grains larger than are typically found in the interstellar medium are needed. The lower, background, circular polarization is produced by scattering off randomly oriented grains in the outflow cavities, the grain alignment being destroyed by the passage of shocks.
We put forward a morphological model for OMC-1 which has the regions of high polarization separate from, but near to, the main outflow region. Those regions exhibiting high polarization must somehow have a direct view of the illuminating source of the nebula.
Implications of this work to the origins of life are briefly discussed.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): polarization - scattering - stars: pre-main-sequence - ISM: individual: OMC-1 - ISM: jets and outflows - reflection nebulae
Simbad objects: 6
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