Paramagnetic Grain Alignment Associated with Internal Friction and the Polarization Efficiency

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概要

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• Alignment mechanisms associated with paramagnetic relaxation are re-investigated for spheroidal dielectric grains. By taking into account the tight coupling of grain axis with angular momentum due to effective dissipation of rotational energy by internal friction, the degree of alignment by paramagnetic torque will be distinctly improved as compared with that by the classical Davis-Greenstein process. Incorporated with new results by Rogers and Martin on the polarizing effectiveness of spheroidal grains, the "improved" DG theory is used to calculate the polarization efficiency due to incompletely aligned grains. It is found that oblate grains with axial ratio of 1/2 or less and size of 0.1μm can explain the observed polarization if the magnetic field strength is ≃3μG in the general interstellar medium where n_H≃1 cm^<-3> and T_g≃100 K. Alignments of suprathermally spinning grains are also investigated for various grain models. The alignment efficiency is found to depend strongly on the frequency of crossover and the grain shape.Interstellar PolarizationAlignment MechanismPolarization EfficiencyMagnetic Field Strength

• 東北大学の論文
• 1986-09-30

著者

• Seki Munezo

  College Of General Education Tohoku University

• HASEGAWA Tatsuhiko

  Astronomical Institute, Faculty of Science, Tohoku University

• Hasegawa Tatsuhiko

  Astronomical Institute Faculty Of Science Tohoku University

関連論文

• Spectroscopic Observations of Several Stars Toward the Bok Globule B361
• Polarization Efficiency and Phase Function Calculated on the Basis of the Mie Theory
• Paramagnetic Grain Alignment Associated with Internal Friction and the Polarization Efficiency

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