暗物质粒子探测器的玻色子排列
Boresight Alignment of DArk Matter Particle Explorer
摘要：
暗物质粒子探测器（DAMPE）可以测量能量范围从几个GeV到大约10 TeV的$γ$射线。相对于DAMPE有效载荷的参考系重建每个$γ$射线的方向。本文采用极大似然法，利用以多个亮点源为中心的$γ$射线数据，测量并校正DAMPE有效载荷相对于真实天体坐标系的角偏差，即所谓的“天体偏差”。作为检验，我们还估计了几组模拟数据与人工定向的bohemite对齐，并获得一致的结果。随时间变化的bobbin对齐分析没有显示参数显著变化的证据。
英文摘要：
The DArk Matter Particle Explorer (DAMPE) can measure $γ$-rays in the energy range from a few GeV to about 10 TeV. The direction of each $γ$-ray is reconstructed with respect to the reference system of the DAMPE payload. In this paper, we adopt a maximum likelihood method and use the $γ$-ray data centered around several bright point-like sources to measure and correct the angular deviation from the real celestial coordinate system, the so called ``boresight alignment'' of the DAMPE payload. As a check, we also estimate the boresight alignment for some sets of simulation data with artificial orientation and obtain consistent results. The time-dependent boresight alignment analysis does not show evidence for significant variation of the parameters.
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