Statistics – Applications
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21621803l&link_type=abstract
American Astronomical Society, AAS Meeting #216, #218.03; Bulletin of the American Astronomical Society, Vol. 41, p.885
Statistics
Applications
Scientific paper
Dust particles in interstellar gas are charged and interact with magnetic fields. This results in their acceleration by stochastic magnetic fields. I shall demonstrate that grain acceleration that arises from the interaction of interstellar turbulence may be efficient and result in supersonic motion of dust. This acceleration may act as pre-acceleration of dust grains that can later be accelerated by astrophysical shocks and thus influence the elemental abundances of cosmic rays.
In addition, I shall talk about the internal dynamics of dust particles. One of the most important applications of this is the alignment of dust grains in respect to magnetic fields, which provides the easiest means of studying interstellar magnetic fields. I shall show that the textbook solutions of the alignment problem are not tenable for most of the interstellar grains. Instead, I shall identify grain helicity, which stems from their irregularity, as the most important component of the alignment theory. I shall demonstrate a simple analytical model of a helical grain that is able to explain the existing observational data (including the cases when the alignment fails) and thus allows reliable studies of magnetic fields.
Finally, I shall discuss the interaction of radiation and plasma with the population of the smallest grains, PAHs, to show that these dust particles of the size less than 50 Angstroms can be responsible for the anomalous microwave emission that affects the CMB measurements.
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