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arXiv 2109.04709astro-ph.HE
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硬观测X射线调制望远镜的在轨定时标定

In-orbit timing calibration of the Insight-Hard X-ray Modulation Telescope

Youli Tuo, Xiaobo Li, Mingyu Ge, Jianyin Nie, Liming Song, Yupeng Xu, Shijie Zheng, Fangjun Lu, Shuang-Nan Zhang, Congzhan Liu, Xuelei Cao, Yong Chen, Jinlu Qu,… 展开作者

Youli Tuo, Xiaobo Li, Mingyu Ge, Jianyin Nie, Liming Song, Yupeng Xu, Shijie Zheng, Fangjun Lu, Shuang-Nan Zhang, Congzhan Liu, Xuelei Cao, Yong Chen, Jinlu Qu, Shu Zhang, Haisheng Zhao, Shuo Xiao, Baiyang Wu, Xiangyang Wen, Weichun Jiang, Bin Meng, Weiwei Cui, Wei Li, Yifei Zhang, Xufang Li, Yanji Yang, Ying Tan, Bing Li

摘要:

介绍了硬透视X射线调制望远镜(Insight-HXMT)的定时系统和三个有效载荷的定时标定结果。这三个有效载荷是高能X射线望远镜(HE,20-250 keV)、中能X射线望远镜(ME,5-30 keV)和低能X射线望远镜(LE,1-10 keV)。我们提出了一种方法来纠正的温度依赖的周期响应和长期变化的板载晶体振荡器,特别是对于ME,不携带温度补偿晶体振荡器。测量了蟹状星云脉冲星的到达时间(ToAs),以评估计时系统的精度。由于Jodrell Bank天文台给出的蟹状星云脉冲星星历存在约40 μs的系统误差(Rots et al. 2014),我们利用中子星内部成分探测器(NICER)上的X射线计时仪(XTI)的准同步观测数据来制作蟹状星云星历,并对Insight-HXMT的计时系统进行了验证。计算得到,高、中、低三个波段的ToAs相对于NICER测量值(包括物理源和仪器源)的能量偏移分别为24.7μs、10.1μs和864.7μs,系统的系统误差分别为12.1μs、8.6μs和15.8μs。

英文摘要:

We describe the timing system and the timing calibration results of the three payloads on-board the Insight-Hard X-ray Modulation Telescope (Insight-HXMT). These three payloads are the High Energy X-ray telescope (HE, 20-250 keV), the Medium Energy X-ray telescope (ME, 5-30 keV) and the low Energy X-ray telescope (LE, 1-10 keV). We present a method to correct the temperature-dependent period response and the long-term variation of the on-board crystal oscillator, especially for ME that does not carry a temperature-compensated crystal oscillator. The time of arrivals (ToAs) of the Crab pulsar are measured to evaluate the accuracy of the timing system. As the ephemeris of the Crab pulsar given by Jodrell Bank observatory has systematic errors around 40 μs (Rots et al. 2014), we use the quasi-simultaneous observations of the X-ray Timing Instrument (XTI) on-board the Neutron star Interior Composition Explorer (NICER) to produce the Crab ephemerides and to verify the timing system of Insight-HXMT. The energy-dependent ToAs' offsets relative to the NICER measurements including physical and instrumental origins are about 24.7μs, 10.1μs and 864.7μs, and the systematic errors of the timing system are determined as 12.1μs, 8.6μs, and 15.8μs, for HE, ME and LE respectively.

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