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首页> 外文会议>Proceedings of the 32nd International Cosmic Ray Conference >Probing Nearby CR Accelerators with Milagro/IceCube Hot Spots
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Probing Nearby CR Accelerators with Milagro/IceCube Hot Spots

机译：使用Milagro / IceCube热点探测附近的CR加速器

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Both the acceleration of cosmic rays (CR) in supernova remnant shocks and their subsequent propagationthrough the random magnetic field of the Galaxy deem to result in an almost isotropic CR spectrum. Yet the MILAGROTeV observatory and the IceCube discovered sharp ( 10±) arrival anisotropies of CR nuclei. We suggest a mechanismfor producing such a CR beam which operates en route to the observer. The key assumption is that CRs are scattered by astrongly anisotropic Alfven wave spectrum formed by the turbulent cascade across the local field direction. The strongestpitch-angle scattering occurs for particles moving almost precisely along the field line. Partly because this direction is alsothe direction of minimum of the large scale CR angular distribution, the enhanced scattering results in a weak but narrowparticle excess. The width, the fractional excess and the maximum momentum of the beam are calculated from a systematictransport theory depending on a single scale l which can be associated with the longest Alfven wave, efficiently scatteringthe beam. The best match to all the three characteristics of the beam is achieved at l 1pc. The distance to a possiblesource of the beam is estimated to be within a few 100pc. Possible approaches to determination of the scale l from thecharacteristics of the source are discussed. Alternative scenarios of drawing the beam from the galactic CR backgroundare considered. The beam related large scale anisotropic CR component is found to be energy independent which is alsoconsistent with the observations.
机译：超新星遗留下来的冲击中宇宙射线（CR）的加速以及它们随后通过银河系的随机磁场的传播都产生了几乎各向同性的CR谱。但是MILAGROTeV天文台和IceCube发现了CR核的尖锐（10±）到达各向异性。我们建议一种产生这种CR光束的机制，该CR光束在到达观察者的途中起作用。关键假设是，CRs被湍流级联在局部场方向上形成的强烈各向异性的Alfven波谱散射。最强的螺距角散射发生在几乎精确地沿磁力线移动的粒子上。部分地因为该方向也是大规模CR角分布的最小值的方向，所以增强的散射导致较弱但较窄的粒子过量。光束的宽度，部分超额和最大动量是根据一个系统的传输理论根据单个尺度l计算的，该尺度可以与最长的Alfven波相关联，从而有效地散射光束。光束的所有三个特性的最佳匹配达到l 1pc。到光束的可能来源的距离估计在几百个pc以内。讨论了根据来源特征确定尺度l的可能方法。考虑了从银河CR背景中提取光束的其他方案。发现与束有关的大规模各向异性CR分量与能量无关，这也与观测结果一致。

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