Insight-HXMT/LE时间响应对时序分析的影响
The influence of the Insight-HXMT/LE time response on timing analysis
摘要：
LE是Insight-HXMT的低能量望远镜。它使用扫描电荷器件（SCD）来检测软X射线光子。LE的时间响应由SCD的结构引起。通过理论分析和蒙特卡罗模拟，从功率谱密度、脉冲波形和时间滞后三个方面讨论了LE时间响应对定时分析的影响。在LTR之后，功率谱密度值随频率的增加而单调减小。正弦信号的功率谱密度在频率536 Hz处减少一半。QPO信号的相应频率为458 Hz。QPO的均方根（RMS）具有类似的行为。在LTR之后，QPO信号的中心频率和半峰全宽（FWHM）没有改变。LTR降低了脉冲轮廓的RMS并使脉冲相位偏移。在时域中，LTR仅降低互相关函数的峰值，而不改变峰值位置。因此，它不会影响时间滞后的结果。当考虑从两个仪器获得的时间滞后时，其中一个是LE，预期LTR会导致1.18 ms的滞后。在频域中计算的时滞与在时域中计算的时滞相同。
英文摘要：
LE is the low energy telescope of Insight-HXMT. It uses swept charge devices (SCDs) to detect soft X-ray photons. The time response of LE is caused by the structure of SCDs. With theoretical analysis and Monte Carlo simulations we discuss the influence of LE time response (LTR) on the timing analysis from three aspects: the power spectral density, the pulse profile and the time lag. After the LTR, the value of power spectral density monotonously decreases with the increasing frequency. The power spectral density of a sinusoidal signal reduces by a half at frequency 536 Hz. The corresponding frequency for QPO signals is 458 Hz. The Root mean square (RMS) of QPOs holds the similar behaviour. After the LTR, the centroid frequency and full width at half maxima (FWHM) of QPOs signals do not change. The LTR reduces the RMS of pulse profiles and shifts the pulse phase. In the time domain, the LTR only reduces the peak value of the crosscorrelation function while it does not change the peak position. Thus it will not affect the result of the time lag. When considering the time lag obtained from two instruments and one among them is LE, a 1.18 ms lag is expected caused by the LTR. The time lag calculated in the frequency domain is the same as that in the time domain.
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