Relativistic parsec-scale jets: I. Particle acceleration

被引:10
作者
Beresnyak, AR
Istomin, YN
Pariev, VI
机构
[1] PN Lebedev Phys Inst, Moscow 117924, Russia
[2] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
来源
ASTRONOMY & ASTROPHYSICS | 2003年 / 403卷 / 03期
关键词
acceleration of particles; magnetic fields; plasmas; galaxies : jets;
D O I
10.1051/0004-6361:20030325
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We develop a theory of particle acceleration inside relativistic rotating electron-positron force-free jets with spiral magnetic fields. We considered perturbation of the stationary magnetic field structure and found that acceleration takes place in the regions where the Alfven resonant condition with the eigenmodes in the jet is fulfilled, i.e. where the local Alfven speed is equal to the phase speed of an eigenmode. The acceleration mechanism is regular acceleration by the electric field of the electromagnetic wave, which is the eigenmode of the force-free cylindrical jet: particles drift out of the region of the large wave amplitude near the Alfven resonant surface and gain energy. Acceleration in the strong electric field near the Alfven resonance and synchrotron losses combine to form a power-law energy spectrum of ultra-relativistic electrons and positrons with index between 2 and 3 depending upon the initial energy of the injected particles. The power law distribution ranges from similar to10 MeV to similar to10(3) MeV.
引用
收藏
页码:793 / 804
页数:12
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