An algorithm to resolve gamma-rays from charged cosmic rays with DAMPE
An algorithm to resolve gamma-rays from charged cosmic rays with DAMPE
复制标题
使用 DAMPE 解析带电宇宙射线中的伽马射线的算法
DOI：
10.1088/1674-4527/18/3/27
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
Zang Jing-Jing
中科院分区：
文献类型：
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作者：
Xu Zun-Lei;Duan Kai-Kai;Shen Zhao-Qiang;Lei Shi-Jun;Dong Tie-Kuang;Gargano Fabio;Garrappa Simone;Guo Dong-Ya;Jiang Wei;Li Xiang;Liang Yun-Feng;Mazziotta Mario Nicola;Salinas Maria Fern;a Munoz;Su Meng;Vagelli Valerio;Yuan Qiang;Yue Chuan;Zang Jing-Jing
DARK物质粒子探测器（DAMPE），也被称为中国悟空，于2015年12月17日发射，是一个新的高能宇宙射线和γ射线卫星观测站。DAMPE的主要科学目标之一是以精确的能量、角度和时间分辨率观测GeV-TeV高能γ射线，间接寻找暗物质粒子和进行高能天体物理研究。由于带电宇宙射线相对于γ射线的通量相对较高，因此以足够高的效率识别γ射线，从而最小化带电宇宙射线污染的量是具有挑战性的。在这项工作中，我们提出了一种方法来识别DAMPE数据的基础上的Monte Carlo模拟，使用强大的电磁/强子簇射的热量计和塑料闪烁探测器提供的带电粒子的否决检测提供的歧视。蒙特卡罗模拟表明，在这种选择之后，污染选定的10 GeV γ射线事件的电子和质子的数量不到选定样品的1%。最后，我们使用飞行数据来验证该方法的有效性，突出已知的γ射线源在天空中，并通过重建的Geminga脉冲星的初步光变曲线。
The DArk Matter Particle Explorer (DAMPE), also known as Wukong in China, which was launched on 2015 December 17, is a new high energy cosmic ray and γ-ray satellite-borne observatory. One of the main scientific goals of DAMPE is to observe GeV-TeV high energy γ-rays with accurate energy, angular and time resolution, to indirectly search for dark matter particles and for the study of high energy astrophysics. Due to the comparatively higher fluxes of charged cosmic rays with respect to γ-rays, it is challenging to identify γ-rays with sufficiently high efficiency, minimizing the amount of charged cosmic ray contamination. In this work we present a method to identify γ-rays in DAMPE data based on Monte Carlo simulations, using the powerful electromagnetic/hadronic shower discrimination provided by the calorimeter and the veto detection of charged particles provided by the plastic scintillation detector. Monte Carlo simulations show that after this selection the number of electrons and protons that contaminate the selected γ-ray events at∼ 10GeV amounts to less than 1% of the selected sample. Finally, we use flight data to verify the effectiveness of the method by highlighting known γ-ray sources in the sky and by reconstructing preliminary light curves of the Geminga pulsar.