Accès ouvert déclaré 2023 preprint

The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite

Z. X. Ling, Xiaoqin Sun, C. Zhang, Shi-Yang Sun, Ge Jin, S. N. Zhang, Xue Zhang, Jingyu Chang, Feng Chen, Y. F. Chen, Zhengwei Cheng, Wei Fu, Y. X. Han, Hong Li, Jinfeng Li, Yichen Li, Zilong Li, P. R. Liu, Yanhua Lv, Xinhua Ma, Yanjun Tang, Chuxuan Wang, Ronghuan Xie, Yun‐Shan Xue, A. L. Yan, Qiang Zhang, Chongyun Bao, Hongbo Cai, Haoyi Cheng, Chuanjian Cui, Y. F. Dai, Dongwei Fan, Haibing Hu, J. W. Hu, Ming‐Hsi Huang, Zichun Jia, Chichuan Jin, Dongyue Li, J. Q. Li, He‐Yang Liu, Mingjun Liu, Y. Liu, Haiwu Pan, Yanmei Qiu, M. Sugizaki, Haoran Sun, W. X. Wang, Y. L. Wang, Qing Yang Steve Wu, Xiaolong Xu, Yunfei Xu, Haining Yang, Xiaocheng Yang, Banglin Zhang, Mei Zhang, W. D. Zhang, Zhaoyi Zhang, Daming Zhao, Xiaoqing Cong, Bin Jiang, Longhui Li, Xuerui Qiu, Jianning Sun, D. T. Su, Jing Wang, Chao Wu, Zilong Xu, Xiaoming Yang, S. K. Zhang, Na Zhang, Yongfa Zhu, Huiyong Ban, Xiaodong Bi, Zhengyang Cai, W. Chen, Xiangcheng Chen, Yulong Chen, Yuzhu Cui, Xiulan Duan, Zhenggong Feng, Yue Gao, Junjun He, Tao He, J. J. Huang, F. Li, J. S. Li, Tiejian Li, Tingting Li, Huifang Liu, Li Liu, Ruixia Liu, Shanshan Liu, Nan Meng, Qihui Shi, Ao Sun, Y. M. Wang, Y. B. Wang, Haoyu Wu, Dapeng Xu, Yanji Yang, Y. Y. Yang, X. S. Yu, Keke Zhang, Y. L. Zhang, Yuheng Zhang, Y. T. Zhang, Hong‐Cai Zhou, Xiaobo Zhu, Jiwei Cheng, Lingfeng Qin, Qijun Wang, Miaomiao Bai, Ri Gao, Zhuoyu Ji, Yan-Rui Liu, F. L., Yanjun Shi, Jun Su, Yong Yi Tan, Jingjing Tong, Haitao Xu, C. B. Xue, Guofeng Xue, Wei Yuan

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Le résumé fourni par la source

The Lobster Eye Imager for Astronomy (LEIA), a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe (EP) mission, was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on 27 July 2022. In this paper, we introduce the design and on-ground test results of the LEIA instrument. Using state-of-the-art Micro-Pore Optics (MPO), a wide field-of-view (FoV) of 346 square degrees (18.6 degrees * 18.6 degrees) of the X-ray imager is realized. An optical assembly composed of 36 MPO chips is used to focus incident X-ray photons, and four large-format complementary metal-oxide semiconductor (CMOS) sensors, each of 6 cm * 6 cm, are used as the focal plane detectors. The instrument has an angular resolution of 4 - 8 arcmin (in FWHM) for the central focal spot of the point spread function, and an effective area of 2 - 3 cm2 at 1 keV in essentially all the directions within the field of view. The detection passband is 0.5 - 4 keV in the soft X-rays and the sensitivity is 2 - 3 * 10-11 erg s-1 cm-2 (about 1 mini-Crab) at 1,000 second observation. The total weight of LEIA is 56 kg and the power is 85 W. The satellite, with a design lifetime of 2 years, operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 minutes. LEIA is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation, and by optimizing the working setups of the instrumental parameters. In addition, LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band, albeit limited useful observing time available.

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