Quantitative study of the AMS-02 electron/positron spectra: Implications for pulsars and dark matter properties
Quantitative study of the AMS-02 electron/positron spectra: Implications for pulsars and dark matter properties
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DOI：
10.1103/physrevd.91.063508
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发表时间：
2014-09
影响因子：
5
通讯作者：
Su-jie Lin;Q. Yuan;X. Bi
中科院分区：
文献类型：
--
作者：
Su-jie Lin;Q. Yuan;X. Bi
阿尔法磁谱仪（AMS-02）刚刚公布了对宇宙电子和正电子谱的前所未有的精确测量。本文通过对AMS-02的电子能谱和正电子能谱的整体拟合，结合更新的正电子分数数据，对AMS-02的结果进行了定量研究。采用马尔可夫链蒙特卡罗算法进行拟合。同时确定了初级电子谱和贡献额外正电子的暗物质的参数。我们发现，有一个硬化的初级电子谱在类似60 GeV。在背景光谱中有了这样一个新的特征，暗物质和暗物质都可以很好地解释AMS-02的结果。暗物质的情况下，正电子分数下降到300 GeV，但受到费米伽马射线观测的非常强的约束。拟合结果还表明，有对流的传播模型可能比再加速模型更有利于轻子数据。
The Alpha Magnetic Spectrometer (AMS-02) has just published the unprecedentedly precise measurement of the cosmic electron and positron spectra. In this paper, we try to give a quantitative study on the AMS-02 results by a global fitting to the electron and positron spectra, together with the updated positron fraction data. The Markov chain Monte Carlo algorithm is adopted to do the fitting. The primary electron spectrum and the parameters for pulsars or dark matter that contribute extra positrons are determined simultaneously. We find that there is a hardening of the primary electron spectrum at similar to 60 GeV. With such a new feature at the background spectrum, both the pulsars and dark matter can explain the AMS-02 results very well. The dark matter scenario shows a drop at the positron fraction at similar to 300 GeV but suffers very strong constraints from Fermi gamma-ray observations. The fitting results also suggest that the propagation model with convection may be more favored by the lepton data than the reacceleration model.