Physics of Grain Alignment

Details Physics of Grain Alignment Physics of Grain Alignment

2000-03-22

arxiv.org/abs/astro-ph/0003314v1

ASPConf.Ser.215:69,2000

Astronomy and Astrophysics

Astrophysics

10 pages, review for conference "Cosmic Evolution and Galaxy Formation"

Scientific paper

Aligned grains provide one of the easiest ways to study magnetic fields in diffuse gas and molecular clouds. How reliable our conclusions about the inferred magnetic field depends critically on our understanding of the physics of grain alignment. Although grain alignment is a problem of half a century standing recent progress achieved in the field makes us believe that we are approaching the solution of this mystery. I review basic physical processes involved in grain alignment and show why mechanisms that were favored for decades do not look so promising right now. I also discuss why the radiative torque mechanism ignored for more than 20 years looks right now the most powerful means of grain alignment.

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