Modeling and Reproducibility of Suzaku HXD PIN/GSO Background
Modeling and Reproducibility of Suzaku HXD PIN/GSO Background
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DOI：
10.1093/pasj/61.sp1.s17
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发表时间：
2009-01
影响因子：
2.3
通讯作者：
Y. Fukazawa;T. Mizuno;S. Watanabe;M. Kokubun;H. Takahashi;N. Kawano;S. Nishino;M. Sasada;
中科院分区：
文献类型：
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作者：
Y. Fukazawa;T. Mizuno;S. Watanabe;M. Kokubun;H. Takahashi;N. Kawano;S. Nishino;M. Sasada;
朱雀硬X射线探测器（HXD）通过利用安装在BGO主动屏蔽中的PIN光电二极管和GSO散射器尽可能地排除粒子背景和康普顿散射事件，实现了比任何其他以前或目前在10-600 keV能量范围内敏感的运行任务最低的本底水平。由于它不具有成像能力，也没有摇摆模式的背景监测器，灵敏度是有限的非X射线背景（NXB）模型的再现性。我们对HXD NXB进行了建模，它随时间以及其他低地球轨道卫星的变化，通过使用几个参数，包括粒子监测器计数和卫星轨道/姿态信息。模型背景作为事件文件提供，其中背景事件由随机数生成，并且可以以与真实的数据相同的方式进行分析。NXB模型的重现性取决于事件选择标准（如截止刚度和能带）和积分时间，对于大于10 ks的照射量，系统误差估计为小于3%（PIN 15-40 keV）和1%（GSO 50-100 keV）。
Suzaku Hard X-ray Detector (HXD) achieved the lowest background level than any other previously or currently operational missions sensitive in the energy range of 10–600 keV, by utilizing PIN photodiodes and GSO scintillators mounted in BGO active shields to reject particle background and Compton-scattered events as much as possible. Because it does not have an imaging capability nor rocking mode for the background monitor, the sensitivity is limited by the reproducibility of the non X-ray background (NXB) model. We modeled the HXD NXB, which varies with time as well as other satellites with a low-Earth orbit, by utilizing several parameters, including particle monitor counts and satellite orbital/attitude information. The model background is supplied as an event file in which the background events are generated by random numbers, and can be analyzed in the same way as the real data. The reproducibility of the NXB model depends on the event selection criteria (such as cut-off rigidity and energy band) and the integration time, and the 1 systematic error is estimated to be less than 3% (PIN 15–40 keV) and 1% (GSO 50–100 keV) for more than 10 ks exposure.