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Model for how an accretion disk drives astrophysical jets and sheds angular momentum

Paul M Bellan2018年Plasma Physics and Controlled FusionIF 2.2出版社

Clumps of ions and neutrals in the weakly ionized plasma in an accretion disk are shown to follow trajectories analogous to those of fictitious 'metaparticles' having a charge to mass ratio reduced from that of an ion by the ionization fraction. A certain class of meta-particles have zero-canonical angular momentum and so spiral in towards the star. Accumulation of these meta-particles establishes a radial electric field that drives the electric current that flows in bidirectional astrophysical jets lying along the disk axis and provides forces that drive the jets. The entire process converts gravitational potential energy into jet energy while absorbing angular momentum from accreting material and shedding this angular momentum at near infinite radius.

日本語訳

降着円盤内の弱電離プラズマ中のイオンと中性粒子の塊は、電荷質量比が電離度によってイオンのそれから減少した仮想的な「メタ粒子」の軌道と類似した軌道をたどることが示される。ある種のメタ粒子はゼロ正準角運動量を持ち、したがって恒星に向かって螺旋状に落下する。これらのメタ粒子の蓄積は、円盤軸に沿って流れる双方向性の天体ジェットを駆動する電場を確立し、ジェットを駆動する力を提供する。このプロセス全体は、降着物質から角運動量を吸収しながら重力ポテンシャルエネルギーをジェットエネルギーに変換し、この角運動量をほぼ無限遠の半径で放出する。

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