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Title: The extent of power-law energy spectra in collisionless relativistic magnetic reconnection in pair plasma

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 σ 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 σ and L, respectively. As a result, for large L and σ, the power-law index α approaches about 1.2.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Princeton Univ., Princeton, NJ (United States)
  3. Univ. of Colorado and National Institute of Standards and Technology, Boulder, CO (United States); Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of Colorado and National Institute of Standards and Technology, Boulder, CO (United States)
Publication Date:
OSTI Identifier:
1261075
Report Number(s):
SLAC-PUB--16599
Journal ID: ISSN 2041-8213; arXiv:1409.8262
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 816; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS astrophysics; ASTRO; acceleration of particles; galaxies: jets; gamma-ray burst: general; magnetic reconnection; pulsars: general; relativistic processes