Interstellar Dust Grain Alignment

被引：409

作者：

Andersson, B-G ^{[1
]}

Lazarian, A. ^{[2
]}

Vaillancourt, John E. ^{[1
]}

机构：

[1] NASA, Ames Res Ctr, SOFIA Sci Ctr, Univ Space Res Assoc, Moffett Field, CA 94035 USA

[2] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

来源：

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 53 | 2015年 / 53卷

关键词：

ISM: extinction; ISM: magnetic fields; polarization; MAGNETIC-FIELD STRUCTURE; SUBMILLIMETER POLARIZATION SPECTRUM; POLYCYCLIC AROMATIC-HYDROCARBONS; FAR-INFRARED POLARIMETRY; TAURUS DARK CLOUDS; 350; MU-M; RADIATIVE TORQUES; WAVELENGTH DEPENDENCE; SIZE DISTRIBUTION; LINEAR-POLARIZATION;

D O I：

10.1146/annurev-astro-082214-122414

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Interstellar polarization at optical-to-infrared wavelengths is known to arise from asymmetric dust grains aligned with the magnetic field. This effect provides a potentially powerful probe of magnetic field structure and strength if the details of the grain alignment can be reliably understood. Theory and observations have recently converged on a quantitative, predictive description of interstellar grain alignment based on radiative processes. The development of a general, analytical model for this radiative alignment torque (RAT) theory has allowed specific, testable predictions for realistic interstellar conditions. We outline the theoretical and observational arguments in favor of RAT alignment, as well as reasons the "classical" paramagnetic alignment mechanism is unlikely to work, except possibly for the very smallest grains. With further detailed characterization of the RAT mechanism, grain alignment and polarimetry promise to not only better constrain the interstellar magnetic field but also provide new information on the dust characteristics.

引用

页码：501 / 539

页数：39

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