Mechanical Alignment of Suprathermally Rotating Grains
نویسندگان
چکیده
منابع مشابه
Alignment of suprathermally rotating grains
It is shown, that mechanical alignment can be efficient for suprathermally rotating grains, provided that they drift with supersonic velocities. Such a drift should be widely spread due to both Alfvénic waves and ambipolar diffusion. Moreover, if suprathermal rotation is caused by grain interaction with a radiative flux, it is shown, that mechanical alignment may be present even in the absence ...
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We discuss the dynamics of dust grains subjected to uncompensated torques arising from H2 formation. In particular, we discuss grain dynamics when a grain spins down and goes through a “crossover”. As first pointed out by Spitzer & McGlynn (1979), the grain angular momentum before and after a crossover event are correlated, and the degree of this correlation affects the alignment of dust grains...
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We present an exact formulation of the physics of Barnett relaxation. Our formulation is based on a realistic kinetic model of the relaxation mechanism which includes the alignment of the grain angular momentum in body coordinates by Barnett dissipation, disalignment by thermal fluctuations, and coupling of the angular momentum to the gas via gas damping. We solve the Fokker-Planck equation for...
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Received ; accepted – 2 – ABSTRACT Since the classical work by Purcell (1979) it has been generally accepted that most interstellar grains rotate suprathermally. Suprathermally rotating grains would be nearly perfectly aligned with the magnetic field by paramagnetic dissipation if not for " crossovers " , intervals of low angular velocity resulting from reversals of the torques responsible for ...
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We discuss the dynamics of dust grains subjected to uncompensated torques arising from H 2 formation. In particular, we discuss grain dynamics when a grain spins down and goes through a " crossover ". As first pointed out by Spitzer & McGlynn (1979), the grain angular momentum before and after a crossover event are correlated, and the degree of this correlation affects the alignment of dust gra...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1995
ISSN: 0004-637X,1538-4357
DOI: 10.1086/176252