THESEUS卫星上搭载的XGIS仪器的科学性能
Scientific performances of the XGIS instrument on-board THESEUS
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- INAF/IASF-Milano（意大利国家天体物理研究所米兰天文物理研究所）
- Università degli Studi di Milano-Bicocca（米兰比可卡大学）
- INAF/OAS-Bologna（意大利国家天体物理研究所博洛尼亚天文台）
- INFN, Sezione di Bologna（意大利国家核物理研究所博洛尼分所）
- Università degli Studi di Ferrara（费拉拉大学）
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中文总结 AI 辅助
该研究介绍了THESEUS卫星搭载的XGIS仪器的性能，重点分析其灵敏度与源定位精度，通过蒙特卡洛模拟评估其在伽马射线暴领域的预期科学进展。
中文摘要 AI 辅助
暂现高能天空与早期宇宙探测器（THESEUS）卫星目前正处于欧洲空间局（ESA）M7任务遴选的A阶段研究，其主要依赖XGIS（X与伽马射线成像光谱仪）仪器来发现并精确定位伽马射线暴及其他高能暂现源。XGIS仪器被设计为在2-150 keV能段提供宽视场（>2球面度）的高精度天空成像，同时覆盖近半个天区，具备直至数MeV的良好计时与光谱能力，这一性能通过两台基于编码掩模成像技术的相同相机组合实现，该组合相机的视场部分重叠。本文介绍XGIS的各项性能，重点关注其灵敏度与源定位精度；通过考虑XGIS成像系统设计及高红移伽马射线暴种群特性的详细蒙特卡洛模拟，评估其在伽马射线暴领域预期取得的科学进展。
英文摘要
The Transient High Energy Sky and Early Universe Surveyor (THESEUS) satellite, currently undergoing a Phase-A study for the M7 ESA mission selection, will mainly rely on the XGIS (X and Gamma Imaging Spectrometer) instrument to discover and precisely localise gamma-ray bursts and other high-energy transients. The XGIS instrument has been designed to provide accurate sky images in a wide field of view (>2 steradians) in the 2-150 keV band, coupled to coverage of nearly half of the sky with good timing and spectroscopic capabilities up to several MeV. This will be achieved thanks to the combination of two identical cameras, based on the coded mask imaging technique, oriented to provide partially overlapping fields of view. We present the capabilities of the XGIS, focussing in particular on the sensitivity and source location accuracy. We discuss the expected scientific advances in the GRB field, estimated through detailed Monte-Carlo simulations which take into account the design of the XGIS imaging system and the properties of the GRB population at high redshifts.
