Simulation of the in-flight background and performance of DRO/GTM

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2024-06-13 DOI:10.1007/s10686-024-09946-8

Chenwei Wang, Juan Zhang, Shijie Zheng, Shaolin Xiong, Zhenghua An, Wenxi Peng, Haisheng Zhao, Xiaoyun Zhao, Chao Zheng, Peiyi Feng, Ke Gong, Dongya Guo, Xinqiao Li, Jiacong Liu, Yaqing Liu, Wenjun Tan, Yue Wang, Wangchen Xue, Sheng Yang, Dali Zhang, Fan Zhang, Yanqiu Zhang

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Abstract

As a new member of the high energy astronomical transient monitoring network, Gamma-ray Transient Monitor (GTM) is an all-sky monitor onboard the Distant Retrograde Orbit (DRO) mission which has been launched in March 2024. In this work, we investigate the space radiation environment of DRO, and study the in-flight background of GTM using GEANT4. The background count rate on each of the 5 GTP detectors of GTM is estimated to be about 800\(\sim \)1000 counts/s in the energy range from 20 keV to 1 MeV after one-year operation on orbit. We find that there are two distinct spectral lines clearly visible in the background spectrum, i.e. the 59 keV emission line from the embedded calibration source \(^{241}\)Am and the 511 keV emission line induced by space radiations, which are suitable for the in-flight energy gain calibration. These results provide important reference for the development of payload, design of observation strategies, in-flight calibration of instrument and research of scientific objectives.

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模拟飞行背景和 DRO/GTM 性能

作为高能天文瞬变监测网络的新成员，伽马射线瞬变监测仪（GTM）是2024年3月发射的遥远逆行轨道（DRO）任务上的全天空监测仪。在这项工作中，我们调查了 DRO 的空间辐射环境，并利用 GEANT4 研究了 GTM 的飞行本底。在轨运行一年后，GTM的5个GTP探测器在20 keV到1 MeV的能量范围内的本底计数率估计约为800\(\sim \)1000 计数/秒。我们发现在背景光谱中有两条明显的光谱线，即来自嵌入校准源 \(^{241}\)Am 的 59 keV 发射线和由空间辐射引起的 511 keV 发射线，这两条光谱线适合于飞行中能量增益校准。这些结果为有效载荷的开发、观测策略的设计、仪器的飞行校准和科学目标的研究提供了重要参考。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.