Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341206l&link_type=abstract
American Astronomical Society, AAS Meeting #213, #412.06; Bulletin of the American Astronomical Society, Vol. 41, p.218
Astronomy and Astrophysics
Astrophysics
Scientific paper
For a long time the dynamics of dust particles was approximated by that of absolutely rigid spheroids with no internal structure; the driving was accounted by gas bombarding the surface of the spheroids. The real dust dynamics is very different. First of all, irregular grains have non-zero helicity, which results in strong torques that emerge when grains interact with radiation and/or gaseous flows. This results in grain alignment, which is far more efficient than the competing processes described in textbooks. Second, the processes of alignment can be different for grains which inertia is approximated by spheroids and ellipsoids of inertia. Third, interactions of grains with ions are frequently more important than with the neutral atoms.
Our research shows that, in spite of all these complexities, grain dynamics and grain alignment can be understood with sufficiently simple models. In particular, I shall present an analytical model that describes well the alignment of helical grains, present the calculations of the rate of rotation and degree of alignment for grains in different astrophysical environments. In particular, I shall discuss the dynamics of very large grains, which are present in accretion disks and the dynamics of very small grains or PAHs, which are responsible for the anomalous foreground emission.
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