Acceleration of Small Dust Grains due to Charge Fluctuations

Details Acceleration of Small Dust Grains due to Charge Fluctuations Acceleration of Small Dust Grains due to Charge Fluctuations

2011-12-15

arxiv.org/abs/1112.3409v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

14 pages, 9 figures, some typos fixed, discussion revised. Submitted to Astrophysical Journal

Scientific paper

We consider the acceleration of very small dust grains including Polycyclic Aromatic Hydrocarbons (PAHs) arising from the electrostatic interactions of dust grains that have charge fluctuations in time due to charging events. We simulate the charge fluctuations of very small grains due to their sticking collisions with electrons and ions in plasma, and the emission of photoelectrons by UV photons using Monte Carlo method. We identify the acceleration induced by the charge fluctuations as the dominant acceleration mechanism of very small grains in the diffuse interstellar medium (ISM). We show that this acceleration mechanism is efficient for environments with low degree of ionization (i.e., large Debye length), where the charge fluctuations are slow but have a large amplitude. We also discuss the implications of the present mechanism for grain coagulation and shattering in the diffuse ISM, molecular clouds, and protoplanetary disks.

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