标题： 低马赫数星系团激波中的相对论电子激波漂移加速 显示英文标题

标题： Relativistic Electron Shock Drift Acceleration in Low Mach Number Galaxy Cluster Shocks

摘要： 一种在低马赫数无碰撞激波中电子激波漂移加速的极端情况被研究，作为星系团中大尺度激波中相对论电子初始加速的一种可能机制，其中上游等离子体温度约为10 keV，磁化程度并不太小。 一维电磁全粒子模拟显示，尽管激波相对较弱，部分热输入电子可以通过相对论激波漂移加速被加速和反射，并在激波上游形成局部非热群体。 这些加速的电子可以自生成局部相干波，并通过这些波被反向散射回激波。 这可能是星系团中大尺度激波如CIZA J2242.8+5301发生的电子激波加速的第一阶段场景，该激波具有明确的射电遗迹。 显示英文摘要

摘要： An extreme case of electron shock drift acceleration in low Mach number collisionless shocks is investigated as a plausible mechanism of initial acceleration of relativistic electrons in large-scale shocks in galaxy clusters where upstream plasma temperature is of the order of 10 keV and a degree of magnetization is not too small. One-dimensional electromagnetic full particle simulations reveal that, even though a shock is rather moderate, a part of thermal incoming electrons are accelerated and reflected through relativistic shock drift acceleration and form a local nonthermal population just upstream of the shock. The accelerated electrons can self-generate local coherent waves and further be back-scattered toward the shock by those waves. This may be a scenario for the first stage of the electron shock acceleration occurring at the large-scale shocks in galaxy clusters such as CIZA J2242.8+5301 which has well defined radio relics.