THE EXTENT OF POWER-LAW ENERGY SPECTRA IN COLLISIONLESS RELATIVISTIC MAGNETIC RECONNECTION IN PAIR PLASMAS

被引：201

作者：

Werner, G. R. ^{[1
]}

Uzdensky, D. A. ^{[1
]}

Cerutti, B. ^{[2
,4
]}

Nalewajko, K. ^{[3
,5
,6
]}

Begelman, M. C. ^{[3
,7
]}

机构：

[1] Univ Colorado, Dept Phys, Ctr Integrated Plasma Studies, 390 UCB, Boulder, CO 80309 USA

[2] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[3] Univ Colorado, JILA, 440 UCB, Boulder, CO 80309 USA

[4] NIST, 440 UCB, Boulder, CO 80309 USA

[5] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA

[6] Stanford Linear Accelerator Ctr, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA

[7] Dept Astrophys & Planetary Sci, 391 UCB, Boulder, CO 80309 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 816卷 / 01期

基金：

美国国家科学基金会;

关键词：

acceleration of particles; galaxies: jets; gamma-ray burst: general; magnetic reconnection; pulsars: general; relativistic processes; GAMMA-RAY FLARES; PARTICLE-ACCELERATION; CRAB-NEBULA; ELECTRON ACCELERATION; NONTHERMAL PARTICLES; CURRENT SHEET; DISSIPATION; SIMULATIONS; BLAZARS; WIND;

D O I：

10.3847/2041-8205/816/1/L8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using two-dimensional particle-in-cell simulations, we characterize the energy spectra of particles accelerated by relativistic magnetic reconnection (without guide field) in collisionless electron-positron plasmas, for a wide range of upstream magnetizations sigma and system sizes. L. The particle spectra are well-represented by a power law gamma(-alpha), with a combination of exponential and super-exponential high-energy cutoffs, proportional to sigma and L, respectively. For large L and sigma, the power-law index alpha approaches about 1.2.

引用

页数：5

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