Grain Acceleration in Compressible MHD Turbulence

Details Grain Acceleration in Compressible MHD Turbulence Grain Acceleration in Compressible MHD Turbulence

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341211y&link_type=abstract

American Astronomical Society, AAS Meeting #213, #412.11; Bulletin of the American Astronomical Society, Vol. 41, p.219

Astronomy and Astrophysics

Astronomy

Scientific paper

Dust sizes are affected by the grain collisions through the coagulation and shattering processes. The effects of the collisions depend on the relative velocities of grains. We discuss a new type of dust acceleration mechanism that acts in a turbulent magnetized medium. The magnetohydrodynamic (MHD) turbulence includes both fluid motions and magnetic fluctuations. While the fluid motions bring about grain motions through the drag, the electromagnetic fluctuations can accelerate grains through resonant as well as nonresonant interactions.
We show that the large scale compression can accelerate dust grains provides higher velocities for a given range of scales than the process of resonance acceleration proposed in Yan & Lazarian (2003). Slow modes turbulence dominate the non-resonant acceleration. The latter was considered the dominant acceleration process in the magnetized interstellar gas. We also compare the velocities with those arising from H2 formation and the variations of the accommodation coefficient over grain surface.
We discuss the consequence of the acceleration and calculate the equilibrium size distribution of grains. The implications for grain mixing, extinction curve, grain alignment, chemical abundance, etc, will be presented.

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