Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348517h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #485.17; Bulletin of the American Astronomical Society, Vol. 41, p.458
Astronomy and Astrophysics
Astronomy
Scientific paper
We study the alignment of grains subject to both radiative torques and pinwheel torques while accounting for thermal flipping of grains. Lazarian \& Draine model of thermal grain flipping. We perform calculations for grain flipping time, taking into account stochastic torques associated with pinwheel torques, e.g. the stochastic torques arising from H$_2$ formation. We take into account the Barnett relaxation and nuclear relaxation. We also consider both paramagnetic and superparamagnetic grains. We show that sufficiently small grains flip fast and because of this get thermally trapped, i.e. rotate thermally in spite of the presence of pinwheel torques. We show that for sufficiently large grains the pinwheel torques can increase the degree of grain alignment achievable with the radiative torques. The effect arises from increasing the magnitude of the angular momentum of grains aligned by radiative torques. We predict that for ordinary paramagnetic grains the degree of grain alignment may correlate with the pinwheel torque efficiency.
Hoang Thiem
Lazarian Alex
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