(中国科学院紫金山天文台南京 210023)

Energy Reconstruction of Dark Matter Particle Explorer and Analysis of Cosmic-ray Proton Flux
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( Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023)

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摘要:

宇宙线的观测研究和暗物质粒子的间接探测是高能天体物理领域两个重大研究课题. 自1912年V. Hess发现宇宙线开始, 人类对宇宙线的观测历史已经超过了一个世纪, 传统理论模型预言膝'区以下能段的宇宙线能谱应服从单一幂率分布, 而近些年的空间和高空气球实验表明10 GeV--100 TeV的宇宙线质子能谱可能存在偏离单一幂律谱分布的重要结构, 这对研究银河系内宇宙线的起源、传播和加速机制具有重要意义. 另一方面, 得益于宇宙线和伽马射线观测精度的提高和观测能段的拓宽, 暗物质粒子的间接探测在国际上受到越来越多的关注, 暗物质粒子可能会发生湮灭或衰变产生稳定的普通高能粒子, 包括正负电子对、正反质子对、伽马射线和中微子等, 进而在宇宙线或伽马射线留下可探测的信号.

Abstract:

The observation of cosmic rays and indirect detection of dark matter particles are two important topics in high-energy astrophysics. In 1912, V. Hess discovered the cosmic rays. Since then, the observation of cosmic rays has lasted for more than a century. Traditional theories suggest that the cosmic-ray flux follows a single power-law below the so called knee' at a few PeV energies. Recent measurements of cosmic-ray proton flux from space-based observatories and balloon-borne experiments have revealed some unexpected structures in the energy range of 10 GeV--100 TeV, which provided important clues for the study of the origin, propagation, and acceleration mechanism of galactic cosmic rays. On the other hand, thanks to the improvement of observational accuracy and the extending of observational energy range for cosmic-rays and gamma-rays, the indirect detection of dark matter particles (DM) has attracted more and more attentions in the past few years. DM annihilation/decay may produce $e^{\pm}$, protons, and anti-protons, gamma-rays, or neutrinos, which can potentially lead to observable signals in cosmic-rays or gamma-rays.

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• 在线发布日期: 2020-09-29
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