各向异性和梯度问题的统一解
A unified solution to the anisotropy and gradient problems
摘要：
费米-LAT合作最近证实了观测到的银河系伽马射线漫发射纵向剖面与假设银河系超新星遗迹产生宇宙射线（CR）的数值代码计算结果之间的差异;精确的费米-LAT测量使得这种异常很难用传统的扩散方案来解释。此外，从μ介子探测器和广泛的空气簇射实验的大尺度偶极各向异性的CR的实验数据很难兼容的模型预测的框架内，传统的各向同性和均匀的传播。我们认为，考虑到CR逃逸时间和空间相关的磁湍流功率之间的物理动机良好的相关性，有可能以非常自然的方式同时解决这两个问题。事实上，通过利用这种相关性，我们发现传播模型，适合广泛的CR初级和次级光谱，并始终再现CR各向异性的能量范围100 GeV - 10 TeV和伽马射线经度分布最近测量的费米-LAT。
英文摘要：
The Fermi-LAT collaboration recently confirmed a discrepancy between the observed longitudinal profile of gamma-ray diffuse emission from the Galaxy and that computed with numerical codes assuming that Cosmic Rays (CRs) are produced by Galactic supernova remnants; the accurate Fermi-LAT measurements make this anomaly hardly explainable in terms of conventional diffusion schemes. Moreover, experimental data from both Muon detector and Extensive Air Shower experiments about the large scale dipole anisotropy of CRs can hardly be compatible with model predictions within the framework of conventional isotropic and homogeneous propagation. We argue that, accounting for a well physically motivated correlation between the CR escape time and the spatially dependent magnetic turbulence power, it is possible to solve both problems at the same time in a very natural way. Indeed, by exploiting this correlation, we find propagation models that fit a wide set of CR primary and secondary spectra, and consistently reproduce the CR anisotropy in the energy range 100 GeV - 10 TeV and the gamma-ray longitude distribution recently measured by Fermi-LAT.
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