期刊
ASTROPHYSICAL JOURNAL
卷 791, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/791/1/71
关键词
acceleration of particles; accretion, accretion disks; plasmas
资金
- National Science Foundation Graduate Research Fellowship [DGE-1106400]
- NASA HTP [NNX11AJ37G]
- NSF [AST-1333682]
- Simons Foundation
- David and Lucile Packard Foundation
- Thomas Alison Schneider Chair in Physics at UC Berkeley
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1333612, 1333682] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1333091] Funding Source: National Science Foundation
We use analytic estimates and numerical simulations of test particles interacting with magnetohydrodynamic (MHD) turbulence to show that subsonic MHD turbulence produces efficient second-order Fermi acceleration of relativistic particles. This acceleration is not well described by standard quasi-linear theory but is a consequence of resonance broadening of wave-particle interactions in MHD turbulence. We provide momentum diffusion coefficients that can be used for astrophysical and heliospheric applications and discuss the implications of our results for accretion flows onto black holes. In particular, we show that particle acceleration by subsonic turbulence in radiatively inefficient accretion flows can produce a non-thermal tail in the electron distribution function that is likely important for modeling and interpreting the emission from low-luminosity systems such as Sgr A* and M87.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据