Application of the observation simulator in the eXTP mission
Application of the observation simulator in the eXTP mission
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DOI：
10.1007/s10686-023-09910-y
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发表时间：
2023-08
影响因子：
3
通讯作者：
L. Qi;Gang Li;Yupeng Xu;Juan Zhang;M. Ge;Jingyu Xiao;Wentao Ye;Yunxiang Xiao;Xiaobo Li-Xiao
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文献类型：
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作者：
L. Qi;Gang Li;Yupeng Xu;Juan Zhang;M. Ge;Jingyu Xiao;Wentao Ye;Yunxiang Xiao;Xiaobo Li-Xiao
为计划中的增强型X射线定时和偏振观测站（eXTP）上的光谱聚焦阵列（SFA）和偏振聚焦阵列（PFA）建立了观测模拟器。它由光子生成、成像、探测和事件读出组成，以生成数据产品，可以通过标准天文分析软件进行分析。它用于模拟一些天文源，以估计和了解有效载荷和平台设计配置对 eXTP 科学目标的影响，包括 SFA 中中心像素的背景估计、硅漂移探测器信号的位置依赖性及其影响以及指向抖动要求。 SFA和PFA有效载荷的联合数据分析表明，PFA图像可以帮助估计附近源对目标源的影响，并选择合适的像素用于SFA中中心像素的背景估计。毫秒脉冲星的光谱和定时研究表明，硅漂移探测器信号本身的位置依赖性对结果影响不大。黑洞0.01Hz~30Hz的C型低频准周期振荡被认为提高了望远镜的指向抖动要求。在这种情况下，望远镜的稳定性应小于 12\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{\prime \prime }$$\end{document} 以避免任何虚假调制信号。这些例子证明了太空任务中端到端观测模拟器的必要性，地面部分将在更广泛的应用中进一步测试和改进该模拟器。
An observation simulator is established for the Spectroscopy Focusing Array (SFA) and Polarimetry Focusing Array (PFA) onboard the planned enhanced X-ray Timing and Polarimetry observatory (eXTP). It consists of photon generation, imaging, detection, and event readout to generate data products, which can be analyzed by the standard astronomical analysis software. It is used to simulate a few astronomical sources to estimate and understand the impact of the payload and platform design configurations on the scientific goals of eXTP, including the background estimation of the central pixel in SFA, position dependence of silicon drift detector signals and its impacts, and pointing jitter requirements. The joint data analysis of the SFA and PFA payloads shows that the PFA image can help estimate the impact of nearby sources on the target source and select the proper pixels for the background estimation of the central pixel in SFA. The spectral and timing study of the millisecond pulsar depicts that the position dependence of silicon drift detector signals itself has an insignificant impact on the results. The type-C low-frequency quasi-periodic oscillations of black holes ranging from 0.01 Hz to 30 Hz are considered to raise the pointing jitter requirements of the telescope. In this case, the stability of the telescope should be less than 12\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{\prime \prime }$$\end{document} to avoid any spurious modulation signal. These examples demonstrate the necessity of an end-to-end observation simulator in the space mission, which will be further tested and improved by the ground segment in a wider range of applications.