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arXiv 1809.01966astro-ph.HEastro-ph.SRphysics.plasm-ph
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相对论等离子体turbulence中的电子和离子相互作用

Electron and ion energization in relativistic plasma turbulence

Vladimir Zhdankin, Dmitri A. Uzdensky, Gregory R. Werner, Mitchell C. Begelman

摘要:

电子和离子隙(即,加热和非热加速)是等离子体湍流的基本但知之甚少的结果。在这项工作中,我们提出了新的结果,在这个主题从粒子在细胞模拟驱动湍流无碰撞,相对论性电子离子等离子体。我们专注于温度,使离子(质子)是次相对论和电子是超相对论,一个政权的高能天体物理系统,如热吸积流到黑洞。我们发现,离子倾向于优先加热,获得了一个数量级以上的能量比电子,并提出了一个简单的经验公式来描述的电子-离子的能量分配作为一个函数的比例的电子-离子gyroradii(这反过来又是一个函数的初始温度和等离子体β)。我们还发现,虽然有效的非热粒子加速发生在超相对论制度的两个物种,非热电子人口减少,而非热离子人口基本上不变的温度降低。这些结果对热吸积流的模拟和解释观测具有一定的意义。

英文摘要:

Electron and ion energization (i.e., heating and nonthermal acceleration) is a fundamental, but poorly understood, outcome of plasma turbulence. In this work, we present new results on this topic from particle-in-cell simulations of driven turbulence in collisionless, relativistic electron-ion plasma. We focus on temperatures such that ions (protons) are sub-relativistic and electrons are ultra-relativistic, a regime relevant for high-energy astrophysical systems such as hot accretion flows onto black holes. We find that ions tend to be preferentially heated, gaining up to an order of magnitude more energy than electrons, and propose a simple empirical formula to describe the electron-ion energy partition as a function of the ratio of electron-to-ion gyroradii (which in turn is a function of initial temperatures and plasma beta). We also find that while efficient nonthermal particle acceleration occurs for both species in the ultra-relativistic regime, nonthermal electron populations are diminished with decreasing temperature whereas nonthermal ion populations are essentially unchanged. These results have implications for modeling and interpreting observations of hot accretion flows.

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