Barnett Relaxation in Thermally Rotating Grains | Zendy

A. Lazarian | Zendy; W. G. Roberge | Zendy

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Barnett Relaxation in Thermally Rotating Grains

Author(s) -

A. Lazarian,

W. G. Roberge

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304309

Subject(s) - angular momentum , brownian motion , physics , measure (data warehouse) , relaxation (psychology) , rotation (mathematics) , dissipation , momentum (technical analysis) , classical mechanics , coupling (piping) , statistical physics , langevin equation , mathematics , quantum mechanics , geometry , mechanical engineering , psychology , social psychology , finance , database , computer science , engineering , economics

We present an exact formulation of the physics of Barnett relaxation. Ourformulation is based on a realistic kinetic model of the relaxation mechanismwhich includes the alignment of the grain angular momentum in body coordinatesby Barnett dissipation, disalignment by thermal fluctuations, and coupling ofthe angular momentum to the gas via gas damping. We solve the Fokker-Planckequation for the measure of internal alignment using numerical integration ofthe equivalent Langevin equation for Brownian rotation. The accuracy of ourresults is calibrated by comparing our numerical solutions with exact analyticresults obtained for special cases.We describe an analytic approximation forthe measure of alignment which fits our numerical results for cases ofpractical interest.Comment: 17 pages, 5 figures. Accepted to ApJ

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