Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..309..467r&link_type=abstract
Astrophysics of Dust, ASP Conference Series, Vol. 309,Proceedings of the conference held 26-30 May, 2003 in Estes Park, Colorado
Astronomy and Astrophysics
Astrophysics
16
Scientific paper
Interstellar polarization is known to be caused by elongated dust grains aligned with respect to the Galactic magnetic field. However the physics of the alignment mechanism has proven remarkably difficult to understand. Two processes are required: the ``internal alignment'' of a grain's axes with respect to its angular momentum, and the alignment of the angular momentum with the ambient magnetic field. I argue that the physics of internal alignment is now well established by a number of theoretical advances made over the past decade. Angular momentum alignment remains less well understood, but mounting evidence favors alignment by radiative torques on asymmetrical grains.
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