Cosmic ray电子各向异性作为区分外来源和天体物理源的工具
Cosmic ray electron anisotropies as a tool to discriminate between exotic and astrophysical sources
摘要：
PAMELA，ATIC，PPB BETS和费米合作的最新结果将电子通量测量的能量范围扩展到了100 GeV范围内的未探索能量，证实了HEAT和AMS 01数据已经提出的大约10 GeV的碰撞。这种碰撞可以用奇异物理学背景下的暗物质湮灭来解释，或者用附近的天体物理学来源来解释，例如双星。为了区分初级正电子产生的竞争模型，各向异性的研究，补充光谱测定，显示为寻找轻子过剩的起源的新工具。在这封信中，我们计算了收集所有已知的伽马射线天体（如ATNF目录中所列）和湮灭暗物质对电子通量的贡献，无论是在团晕的情况下，还是在多余的物质可以归因于附近相当大的暗物质团的情况下。我们解决的问题，在这两种情况下的电子各向异性和估计的前景，一个小的偶极各向异性可以发现费米天文台。
英文摘要：
Recent results from the PAMELA, ATIC, PPB BETS and Fermi collaborations extend the energy range in the electron flux measurement up to unexplored energies in the hundred GeVs range confirming the bump starting at about 10GeV already suggested by HEAT and AMS01 data . This bump can be explained by annihilating dark matter in the context of exotic physics, or by nearby astrophysical sources e.g. pulsars. In order to discriminate between competing models for primary positron production, the study of anisotropies ,complementary to the spectrum determination, shows up as new tool to look for the origin of the lepton excess. In this letter we calculate the contribution to the electron flux given by the collection of all known gamma ray pulsars (as listed in the ATNF catalogue) and by annihilating dark matter both in case of a clumpy halo or in case the excess can be atributed to a nearby sizeable dark matter clump. We address the problem of the electron anisotropy in both scenarios and estimate the prospect that a small dipole anisotropy can be found by the Fermi observatory.
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