Polarization properties of spherical interstellar grains on light scattering |
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| Authors: | Masafumi Matsumura Munezo Seki |
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| Institution: | (1) Astronomical Institute, Tohoku University, Sendai, Japan;(2) College of General Education, Tohoku University, Sendai, Japan |
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| Abstract: | On the basis of the Mie theory, the differential cross-section for polarization and the polarization efficiency are calculated for some spherical interstellar grains consisting of ice, silicate, or graphite in the ultraviolet, optical, and near infrared wavelengths. As far as the polarization due to scattering is concerned, these particles scatter light as Rayleigh scattering for 0<x 1, wherex is the dimensionless size parameter. The polarization efficienties depend strongly on the value of the imaginary part (m ) of the refractive index of grain material whenx 1: the efficiency takes a maximum value atx 1 and decreases to zero asx approaches zero for the absorbing sphere such as the dielectric particle withm0.1 or the graphite grain in the infrared wavelengths. |
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