星系际纠缠弱磁场对TeV对束等离子体不稳定性的抑制
Suppression of the TeV pair-beam plasma instability by a tangled weak intergalactic magnetic field
摘要：
研究了亚fG纠缠星系际磁场（IGMF）对耀变体生电子对束静电不稳定性的影响。足够强的IGMF可以显著地偏转TeV对束，这将使次级级联辐射的通量降低到观测极限以下。一个类似的通量减少可能会导致静电束等离子体的不稳定性，这在IGMF的情况下运行最好。考虑关联长度小于1 kpc的IGMF，我们发现弱磁场增加了对束粒子的横向动量，从而大大降低了静电不稳定性的线性增长率，从而降低了对束的能量损失率。我们表明，消除束等离子体的不稳定性作为一个有效的能量损失剂在磁场强度的三个数量级以下，需要通过磁偏转抑制二次级联发射。对于中等强度的IGMF，我们不知道一个可行的过程来解释所观察到的没有GeV尺度的级联发射。
英文摘要：
We study the effect of a tangled sub-fG level intergalactic magnetic field (IGMF) on the electrostatic instability of a blazar-induced pair beam. Sufficiently strong IGMF may significantly deflect the TeV pair beams, which would reduce the flux of secondary cascade emission below the observational limits. A similar flux reduction may result from the electrostatic beam-plasma instability, which operates the best in the absence of IGMF. Considering IGMF with correlation lengths smaller than a kpc, we find that weak magnetic fields increase the transverse momentum of the pair beam particles, which dramatically reduces the linear growth rate of the electrostatic instability and hence the energy-loss rate of the pair beam. We show that the beam-plasma instability is eliminated as an effective energy-loss agent at a field strength three orders of magnitude below that needed to suppress the secondary cascade emission by magnetic deflection. For intermediate-strength IGMF, we do not know a viable process to explain the observed absence of GeV-scale cascade emission.
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