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1. Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070

Author

Xiaobo Li, Zhu Liu, Y. L. Tuo, J. W. Yang, Shuang-Nan Zhang, Aimei Zhang, Yong Chen, Wei Wang, Li Chen, Mao-Shun Li, Hai-Sheng Zhao, C. K. Li, Cheng-Kui Li, Weimin Yuan, Yanji Yang, Juan Wang, Yu-Xuan Zhu, Ju Guan, Xiao-Fan Zhao, Bozena Czerny, Ling-Jun Wang, Qingwen Wu, Xufang Li, Gang Li, R. C. Shang, B. B. Wu, Shaolin Xiong, Yifei Zhang, Tong Zhang, X. Y. Song, Yongjie Zhang, N. Sai, Erlin Qiao, Yi Zhang, Ti-Pei Li, Lian Tao, Wei-Wei Cui, Wan-Chang Zhang, Bin Meng, Yue Zhu, Y. Nang, Liang Sun, Yu-Peng Chen, Ming-Yu Ge, Xiao-Jing Liu, Wei Cui, Zi-Gao Dai, Bobing Wu, Shu Zhang, Gang Chen, Bing Li, Yuan-Yuan Du, Zhi Chang, G. F. Wang, Xiang Ma, Ying Tan, L. D. Kong, T. Luo, Fangjun Lu, Guan-Hua Gao, Shuo Xiao, Juan Zhang, D. K. Zhou, Shu-Mei Jia, Y. P. Chen, Chichuan Jin, Bifang Liu, Wei Li, Jian-Feng Zhou, Ge Ou, Yupeng Xu, Bo Lu, Bei You, He Gao, Chen Wang, Fan Zhang, Yanguo Li, Chong Luo, Qi Luo, Jing Jin, Jing-Kang Deng, Li-Ming Song, Cheng-Cheng Guo, XiangYang Wen, Xiaohua Liang, C. X. Liu, C. Cai, Yue Huang, Yuan You, Jia Huo, Zi-Liang Zhang, J. C. Liu, Zhao Zhang, Yongwei Dong, Qi-Bin Yi, Mei Wu, W. C. Jiang, Jin-Yuan Liao, X. L. Cao, Xue-Feng Lu, Guang-Cheng Xiao, Wei Zhang, Chengmo Zhang, Yu-Dong Gu, Hong-Mei Zhang, Tian-Xiang Chen, GuoQing Liu, Y. N. Liu, Qian-Qing Yin, Zheng-Wei Li, Xian Li, Hongwei Liu, Sheng Yang, Wenshuai Wang, Luhua Jiang, Jin-Lu Qu, Jianyin Nie, Min-Xue Fu, Yu-Sa Wang, YongJie Jin, Yue Zhang, Qingcui Bu, Wen-Zhao Zhang, Da-Wei Han, M. Gao, and Shi-Jie Zheng

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Science, Phase (waves), X-ray binary, FOS: Physical sciences, General Physics and Astronomy, Astrophysics, Radiation, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Jet (fluid), Multidisciplinary, Shock (fluid dynamics), 010308 nuclear & particles physics, General Chemistry, Corona, Astrophysics - Astrophysics of Galaxies, High-energy astrophysics, Black hole, Astrophysics of Galaxies (astro-ph.GA), Physics::Space Physics, Reflection (physics), Compact astrophysical objects, Astrophysics - High Energy Astrophysical Phenomena
Abstract

A black hole X-ray binary produces hard X-ray radiation from its corona and disk when the accreting matter heats up. During an outburst, the disk and corona co-evolves with each other. However, such an evolution is still unclear in both its geometry and dynamics. Here we report the unusual decrease of the reflection fraction in MAXI J1820+070, which is the ratio of the coronal intensity illuminating the disk to the coronal intensity reaching the observer, as the corona is observed to contrast during the decay phase. We postulate a jet-like corona model, in which the corona can be understood as a standing shock where the material flowing through. In this dynamical scenario, the decrease of the reflection fraction is a signature of the corona's bulk velocity. Our findings suggest that as the corona is observed to get closer to the black hole, the coronal material might be outflowing faster., 11 pages, 5 figures; published in Nature Communications; An artist's impression of Figure 5 is updated here, and the animation is available at http://youbei.work/research/

Published
2021

2. Confirming the spin parameter of the black hole in Cygnus X-1 using the Insight-HXMT

Author

Yongjie Zhang, Xian Li, Sheng Yang, Zi-Liang Zhang, Yan-Ting Dong, Lian Tao, X. Y. Song, Yupeng Xu, YongJie Jin, Ji-Ren Liu, Mei Wu, T. Luo, Jing Jin, Wan-Chang Zhang, GuoQing Liu, Chen Wang, Wei Cui, S. Xiao, XiangYang Wen, Yu-Dong Gu, Jianyin Nie, Jing-Kang Deng, Xiao-Fan Zhao, J. W. Yang, Yanji Yang, Xiaobo Li, Jia Huo, Yuan You, Gang Li, Youli Tuo, Mao-Shun Li, Qi-Bin Yi, Xufang Li, B. S. Liu, Zheng-Wei Li, Jin-Lu Qu, Yanguo Li, Xue-Ying Zheng, Yu-Peng Chen, Wei Zhang, Cheng-Cheng Guo, Yi Zhang, Li-Ming Song, Juan Zhang, N. Sai, C. Cai, Shaolin Xiong, Xue-Feng Lu, ShiJie Zheng, Jian-Feng Zhou, Q. Luo, Y. P. Chen, L. D. Kong, Wei-Wei Cui, Yongwei Dong, Yuan-Yuan Du, Bing Li, Da-Wei Han, Bin Meng, HongMei Zhang, Li-Jun Gou, Ying Tan, Zhi Zhang, C. L. Zhang, Juan Wang, D. K. Zhou, Shu Zhang, Min-Xue Fu, Jin-Yuan Liao, X. L. Cao, H. T. Liu, LuHua Jiang, Hai-Sheng Zhao, Yu-Sa Wang, X. H. Liang, Ye Feng, Yue Zhang, Guang-Cheng Xiao, Bo Lu, Qingcui Bu, Fangjun Lu, He Gao, Li Chen, Ju Guan, Yong Chen, B. B. Wu, Tong Zhang, Guan-Hua Gao, Shu-Mei Jia, W. S. Wang, Ge Ou, W. C. Jiang, Liang Sun, Tian-Xiang Chen, Qian-Qing Yin, Wei Li, Y. Nang, G. F. Wang, Xiang Ma, Yue-Zhu, Zhao Zhang, W. Z. Zhang, Nan Jia, Fan Zhang, Yu-Xuan Zhu, Yifei Zhang, Shuang-Nan Zhang, Aimei Zhang, Ming-Yu Ge, Xiao-Jing Liu, Yu-Feng Li, Yue Huang, R. C. Shang, Zhi Chang, Zhen-Xuan Liao, H. W. Liu, Gang Chen, Cheng-Kui Li, Yi-Rong Yang, Y. N. Liu, Bobing Wu, Ti-Pei Li, M. Gao, Xue-Shan Zhao, R. L. Zhuang, and C. X. Liu

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, Spectral line, Orbital inclination, law.invention, Telescope, Rotating black hole, Space and Planetary Science, Fitting methods, law, 0103 physical sciences, System parameters, 010303 astronomy & astrophysics, Spin-½, Dimensionless quantity
Abstract

Recently, the system parameters of Cygnus X-1, i.e., the black hole mass M, the orbital inclination i and the source distance D, have been updated. As the input constraints of the continuum-fitting method, it is necessary to refine the spin with these new parameters. The Hard X-ray Modulation Telescope (HXMT, also named Insight) was successfully launched on June 15th, 2017 in China. In this work, we analyzed spectra obtained by the Insight-HXMT during 2017-2018 and re-estimated the spin via the continuum-fitting method. We first re-estimated the spin using old parameters and found the dimensionless spin parameter to be a ⁎ > 0.934 (3σ), which is consistent with previous measurements both from the continuum-fitting and iron-line fitting methods ( Gou et al. 2011 , Gou et al. 2014 ; Fabian et al. 2012 , Walton et al. 2016 , Tomsick et al. 2018 ). Then, when the new parameters were applied, we obtained an increased spin: a ⁎ > 0.967 (3σ), which is also consistent with the recent measurement (Zhao et al. 2020, submitted to ApJ) and also confirms an extreme Kerr black hole lying in this system.

Published
2020
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3. Joint analysis of energy and RMS spectra from MAXI J1535-571 with Insight-HXMT

Author

Z. W. Li, Jin-Lu Qu, He Gao, Y. C. Zhu, Xin Lu, J. X. Wang, ShaoZhen Liu, S. Yang, Xufang Li, Z. Zhang, Z. L. Zhang, Gang Li, W. C. Zhang, Yan Zhu, Long Ji, N. Sai, F. Zhang, Wenda Zhang, Bin Meng, Y. Tan, W. C. Jiang, Chuan-Peng Zhang, He-Yang Liu, Guo-Ming Chen, ShiJie Zheng, Bobing Wu, Y. G. Zheng, C. Cai, J. F. Zhou, D. K. Zhou, T. Luo, Ti-Pei Li, Shuo Xiao, Yuan-Yuan Du, Zhe Chang, Y. N. Liu, X.W. Ma, Tianran Chen, Shu-Mei Jia, Yu-Dong Gu, Bo Lu, Mingyu Wu, Lian Tao, Bing Li, Xuchao Zhao, Jing Jin, Jia Huo, X. Y. Wen, Ju Guan, Fangjun Lu, Jundan Nie, Ge Ou, X. F. Li, Cheng-Cheng Guo, M. Gao, Lei Sun, Hongwei Liu, Y. G. Li, C. Z. Liu, Luhua Jiang, H. M. Zhang, C. Wang, W. S. Wang, W. Z. Zhang, W. G. Li, He Xu, G. H. Gao, Jin-Yuan Liao, X. L. Cao, Min-Xue Fu, Shaolin Xiong, Y. Nang, Y. S. Wang, Junqiang Zhang, Mingzhe Li, Jinyi Yang, Y. Zhang, C. K. Li, Y. Huang, GuoQing Liu, P. J. Wang, Youcai Zhang, Jing-Kang Deng, Xiaohua Liang, G. F. Wang, Yi Zhang, Yuan You, Youli Tuo, Xin Ren, Yin Xu, Weiguang Cui, Q. Luo, Qingcui Bu, L. D. Kong, Y. B. Chen, Ming-Yu Ge, Xiao-Jing Liu, Da-Wei Han, Shuang-Nan Zhang, Li-Ming Song, Wei-Wei Cui, Aimei Zhang, Shuinai Zhang, Peng Zhang, Y. W. Dong, G. C. Xiao, HongSheng Zhao, Y. P. Chen, Xiaobo Li, L. Chen, Yi-Yan Yang, X. Y. Song, Y. J. Yang, T. Zhang, Q. B. Yi, and B. Y. Wu

Subjects
Physics, 010308 nuclear & particles physics, Oscillation, Astrophysics::High Energy Astrophysical Phenomena, Binary number, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, Spectral line, law.invention, Telescope, Black hole, Space and Planetary Science, law, 0103 physical sciences, Modulation (music), Satellite, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract

A new black hole X-ray binary (BHXRB) MAXI J1535-571 was discovered by MAXI during its outburst in 2017. Using observations taken by the first Chinese X-ray satellite, the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT), we perform a joint spectral analysis (2-150 keV) in both energy and time domains. The energy spectra provide the essential input for probing the intrinsic Quasi-Periodic Oscillation (QPO) fractional rms spectra (FRS). Our results show that during the intermediate state, the energy spectra are in general consistent with those reported by Swift/XRT and NuSTAR. However, the QPO FRS become harder and the FRS residuals may suggest the presence of either an additional power-law component in the energy spectrum or a turn-over in the intrinsic QPO FRS at high energies.

Published
2020
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4. Diagnostic of the spectral properties of Aquila X-1 by Insight-HXMT snapshots during the early propeller phase

Author

Jing-Kang Deng, Shaolin Xiong, Q. Luo, Xiaohua Liang, Yuan You, Youli Tuo, Jing Jin, Yin Xu, Jinyi Yang, X. F. Li, Z. L. Zhang, Ju Guan, Y. B. Chen, Lei Sun, Fangjun Lu, Da-Wei Han, Mingzhe Li, W. G. Li, Wenda Zhang, C. Cai, Chuan-Peng Zhang, Y. Huang, Z. W. Li, Jundan Nie, Can Güngör, Hongwei Liu, Li-Ming Song, Y. G. Li, Bobing Wu, Andrea Santangelo, Xufang Li, ShiJie Zheng, Min-Xue Fu, Luhua Jiang, Ti-Pei Li, Gang Li, Y. W. Dong, N. Sai, J. X. Wang, Y. Nang, G. C. Xiao, Shuinai Zhang, Jing Zhou, Xin Lu, Y. N. Liu, Yuan-Yuan Du, Jia Huo, X. Y. Wen, Junqiang Zhang, Y. Tan, F. Zhang, Bin Meng, W. C. Jiang, G. F. Wang, Yi Zhang, C. K. Li, Wei-Wei Cui, L. D. Kong, H. M. Zhang, Shuo Xiao, W. C. Zhang, M. Gao, Bo Lu, Guo-Ming Chen, Xuchao Zhao, C. Wang, Shu-Mei Jia, Shuang-Nan Zhang, G. H. Gao, Aimei Zhang, Ge Ou, Weiguang Cui, Qingcui Bu, HongSheng Zhao, C. Z. Liu, W. Z. Zhang, Y. Zhang, Mingyu Wu, Q. Q. Yin, Y. P. Chen, GuoQing Liu, Bing Li, Y. J. Yang, D. K. Zhou, Y. S. Wang, Yi Chen, Ming-Yu Ge, Xiao-Jing Liu, Xiaobo Li, Youcai Zhang, S. Yang, L. Chen, X. Y. Song, Zhe Chang, T. Zhang, X.W. Ma, Lian Tao, Yi-Nan Zhu, Cheng-Cheng Guo, W. S. Wang, T. Luo, Q. B. Yi, B. Y. Wu, Jin-Yuan Liao, X. L. Cao, He Gao, Z. Zhang, Yan Zhu, Long Ji, Tianran Chen, and Yu-Dong Gu

Subjects
Physics, Accretion (meteorology), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Spectral properties, Propeller, Phase (waves), Astronomy and Astrophysics, Astrophysics, 01 natural sciences, law.invention, Telescope, Accretion disc, Space and Planetary Science, Sky, law, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Spectral analysis, 010303 astronomy & astrophysics, media_common
Abstract

We study the 2018 outburst of Aql X-1 via the monitor of all sky X-ray image (MAXI) data. We show that the outburst starting in February 2018 is a member of short-low class in the frame of outburst duration and the peak count rate although the outburst morphology is slightly different from the other fast-rise-exponential-decay (FRED) type outbursts with a milder rising stage. We study the partial accretion in the weak propeller stage of Aql X-1 via the MAXI data of the 2018 outburst. We report on the spectral analysis of 3 observations of Aquila X-1 obtained by Insight – hard X-ray modulation telescope (Insight-HXMT) during the late decay stage of the 2018 outburst. We discuss that the data taken by Insight-HXMT is just after the transition to the weak propeller stage. Our analysis shows the necessity of a comptonization component to take into account the existence of an electron cloud resulting photons partly up-scattered.

Published
2020
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5. Ground-based calibration and characterization of the HE detectors for Insight-HXMT

Author

Hongwei Liu, Mei Wu, JunCheng Liang, Xiaobo Li, HuiMing Yu, Li-Ming Song, Shuang-Nan Zhang, Xue-Feng Lu, Aimei Zhang, Xufang Li, Tong Zhang, Fan Zhang, GuoQing Liu, Jinjie Wu, Zhi Chang, Yupeng Xu, Xu Zhou, Yifei Zhang, Qiu Xiangping, Fangjun Lu, Ti-Pei Li, R. C. Shang, He Gao, Zheng-Wei Li, HaoRan Liu, YongJie Jin, Zhao Zhang, Jing-Kang Deng, Y. P. Chen, C. X. Liu, Min-Xue Fu, and Shu Zhang

Subjects
Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Payload, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Scintillator, 01 natural sciences, law.invention, Characterization (materials science), Telescope, Optics, Space and Planetary Science, Modulation, law, 0103 physical sciences, Calibration, Astrophysics::Earth and Planetary Astrophysics, business, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract

High energy X-ray telescope (HE) is one of the three instruments of Insight-HXMT (Hard X-ray Modulation Telescope) payload. The HE detector (HED) array is composed of 18 actively NaI(Tl)/CsI(Na) phoswich scintillators with a total geometric area of ∼ 5100 cm 2 and cover the energy range 20∼250 keV. In this paper we describe the on-ground detector-level calibration campaigns and present the principal instrument properties of HEDs.

Published
2019
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6. Timing analysis of the black hole candidate EXO 1846-031 with Insight-HXMT monitoring

Author

Ju Guan, Yuan-Hang Zhang, Wei Zhang, Yue Zhang, W. C. Jiang, Y. G. Zheng, Cheng-Cheng Guo, Cheng-Kui Li, R. C. Shang, W. S. Wang, Shaolin Xiong, GuoQing Liu, Yongwei Dong, Tian-Xiang Chen, Yupeng Xu, Jian-Feng Zhou, Yu-Dong Gu, Qian-Qing Yin, Wei Li, Jianyin Nie, Wei Cui, X. L. Cao, Qingcui Bu, Yongjie Zhang, J. W. Yang, Jing-Yuan Liao, XiangYang Wen, Xiang Ma, Bing Li, Wen-Zhao Zhang, B. B. Wu, Tong Zhang, Zhao Zhang, Lian Tao, X. Y. Song, Zheng-Wei Li, Jing Jin, Zhi Chang, Mao-Shun Li, Yue Zhu, Jia Huo, Wei-Wei Cui, Xian Li, Hongwei Liu, Y. G. Li, Sheng Yang, Bo Lu, ShiJie Zheng, Jin-Lu Qu, H. W. Liu, Da-Wei Han, Wan-Chang Zhang, C. Cai, HongMei Zhang, Gang Li, Luhua Jiang, Yuan-Yuan Du, Min-Xue Fu, Yue Huang, He Xu, Juan Zhang, Xiaobo Li, Min Gao, Shuang-Nan Zhang, Zhi Zhang, Yu-Sa Wang, Li-Ming Song, Xufang Li, Liang Sun, Aimei Zhang, Tao Luo, Yu-Peng Chen, S. Xiao, Fangjun Lu, Li Chen, Shu Zhang, Guan-Hua Gao, Xiao-Fan Zhao, Ling-Jun Wang, N. Sai, He Gao, Q. Luo, Yifei Zhang, Bin Meng, Fan Zhang, Y. P. Chen, Mei Wu, Yu-Xuan Zhu, B. S. Liu, D. K. Zhou, Shu-Mei Jia, Ming-Yu Ge, Xiao-Jing Liu, Juan Wang, Xue-Feng Lu, Ge Ou, Chengmo Zhang, R. L. Zhuang, Hai-Sheng Zhao, C. X. Liu, Gang Chen, Yong Chen, Y. N. Liu, Y. Nang, Guang-Cheng Xiao, G. F. Wang, Jing-Kang Deng, Xiaohua Liang, Yuan You, Youli Tuo, Qi-Bin Yi, Bobing Wu, Ti-Pei Li, Y. J. Yang, Ying Tan, Zi-Liang Zhang, YongJie Jin, Yanji Yang, Yi Zhang, L. D. Kong, and Chen Wang

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Space and Planetary Science, Static timing analysis, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846–031 during its outburst in 2019 with the observations of Insight-HXMT, NICER and MAXI. This outburst can be classified roughly into four different states. Type-C quasi-periodic oscillations (QPOs) observed by NICER (about 0.1–6 Hz) and Insight-HXMT (about 0.7–8 Hz) are also reported in this work. Meanwhile, we study various physical quantities related to QPO frequency. The QPO rms–frequency relationship in the energy band 1–10 keV indicates that there is a turning pointing in frequency around 2 Hz, which is similar to that of GRS 1915+105. A possible hypothesis for the relationship above may be related to the inclination of the source, which may require a high inclination to explain it. The relationships between QPO frequency and QPO rms, hardness, total fractional rms and count rate have also been found in other transient sources, which can indicate that the origin of type–C QPOs is non-thermal.

Published
2020

7. Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT

Author

Yu-Dong Gu, Yue Zhu, L. D. Kong, T. Luo, Chen Wang, Yanji Yang, Shaolin Xiong, Liang Zhang, Yi Zhang, Y. J. Yang, Zi-Liang Zhang, XiangYang Wen, Jia Huo, Hai-Sheng Zhao, Jing-Kang Deng, YongJie Jin, Jin-Yuan Liao, X. L. Cao, Fu-Guo Xie, Ju Guan, X. Y. Song, Mao-Shun Li, D. K. Zhou, Min-Xue Fu, Yu-Peng Chen, Xian Li, Y. P. Chen, Xiaohua Liang, Zheng-Wei Li, Yuan You, Hongwei Liu, Sheng Yang, Qi-Bin Yi, Luhua Jiang, Yanguo Li, Yuan-Yuan Du, Wei-Wei Cui, He Xu, Yu-Sa Wang, Yongjie Zhang, Li-Ming Song, Wan-Chang Zhang, Cheng-Cheng Guo, Wenshuai Wang, Li Chen, Zhi Zhang, Lian Tao, Y. Nang, Shu Zhang, Yongwei Dong, W. C. Jiang, Xue-Feng Lu, Xiao-Fan Zhao, Yue Zhang, Jianyin Nie, Shuo Xiao, Bo Lu, M. Gao, Xiaobo Li, G. F. Wang, Xiang Ma, Chengmo Zhang, Mei Wu, Guan-Hua Gao, Ying Tan, Shi-Jie Zheng, Tian-Xiang Chen, Qingcui Bu, Shu-Mei Jia, Qian-Qing Yin, Wen-Zhao Zhang, Ge Ou, Liang Sun, Bing Li, Jin-Lu Qu, B. B. Wu, Tong Zhang, Y. L. Tuo, Da-Wei Han, J. W. Yang, Juan Zhang, Long Ji, Feng Yuan, Jian-Feng Zhou, Guang-Cheng Xiao, R. L. Zhuang, Yupeng Xu, C. X. Liu, Wei Cui, Fangjun Lu, Jing Jin, Bobing Wu, He Gao, Zhi Chang, Juan Wang, Yifei Zhang, Ti-Pei Li, GuoQing Liu, Ming-Yu Ge, Xiao-Jing Liu, Fan Zhang, Qi Luo, Yong Chen, Yue Huang, Yu-Xuan Zhu, Shuang-Nan Zhang, Aimei Zhang, Cheng-Kui Li, Xufang Li, Gang Li, Wei Li, C. Cai, Zhao Zhang, N. Sai, Bin Meng, R. C. Shang, Gang Chen, Wei Zhang, Bai-Sheng Liu, Ling-Jun Wang, Hong-Mei Zhang, and Y. N. Liu

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Jet (fluid), Photon, Accretion (meteorology), Astrophysics::High Energy Astrophysical Phenomena, X-ray binary, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, law.invention, Black hole, Telescope, law, Quasiperiodic function, Precession, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Low-frequency quasi-periodic oscillations (LFQPOs) are commonly found in black hole X-ray binaries, and their origin is still under debate. The properties of LFQPOs at high energies (above 30 keV) are closely related to the nature of the accretion flow in the innermost regions, and thus play a crucial role in critically testing various theoretical models. The Hard X-ray Modulation Telescope (Insight-HXMT) is capable of detecting emissions above 30 keV, and is therefore an ideal instrument to do so. Here we report the discovery of LFQPOs above 200 keV in the new black hole MAXI J1820+070 in the X-ray hard state, which allows us to understand the behaviours of LFQPOs at hundreds of kiloelectronvolts. The phase lag of the LFQPO is constant around zero below 30 keV, and becomes a soft lag (that is, the high-energy photons arrive first) above 30 keV. The soft lag gradually increases with energy and reaches ~0.9s in the 150-200 keV band. The detection at energies above 200 keV, the large soft lag and the energy-related behaviors of the LFQPO pose a great challenge for most currently existing models, but suggest that the LFQPO probably originates from the precession of a small-scale jet., 36 pages, 12 figures, 3 tables; published in Nature Astronomy

Published
2020

8. Overview to the Hard X-ray Modulation Telescope (Insight-HXMT) Satellite

Author

Mao-Shun Li, YongJie Jin, Cheng-Kui Li, Xiaobo Li, ChunLei Zhang, Shaolin Xiong, C. L. Zou, ShiJie Zheng, C. Wang, W. C. Jiang, Min-Xue Fu, Yifei Zhang, Min Gao, Yu-Sa Wang, Tian-Xiang Chen, Wei Chen, Yuan-Yuan Du, Xufang Li, Jin-Lu Qu, Guan-Hua Gao, Yue Zhu, Shu-Mei Jia, Wei Li, J. W. Yang, Yue Zhang, Tong Zhang, N. Sai, Ming-Yu Ge, Xiao-Jing Liu, Tao Luo, WenHui Tao, Ge Ou, Wen-Zhao Zhang, Qiang Zhang, Juan Wang, Bing Li, Bin Yuan, Guang-Cheng Xiao, ShenYi Zhang, Zhao Zhang, Qi Luo, Bin Meng, Xiao-Fan Zhao, R. C. Shang, Liang Zhang, Bobing Wu, X. Y. Song, Yupeng Xu, Jianling Zhao, Da-Wei Han, Hai-Sheng Zhao, Wei Zhang, Yue Huang, Ti-Pei Li, Can Güngör, HongMei Zhang, Jing Jin, Cheng-Cheng Guo, C. Cai, Jianyin Nie, Wan-Chang Zhang, GuoHong Shen, XiangYang Wen, Shuo Xiao, Yongwei Dong, Yong Chen, Yanguo Li, R. L. Zhuang, C. X. Liu, Li-Ming Song, Wei Hu, Yan Huang, Jin-Yuan Liao, X. L. Cao, Bo Lu, Y. Nang, Yu-Peng Chen, Jing-Kang Deng, Xue-Feng Lu, JiaXi Yu, Xiaohua Liang, Wei-Wei Cui, Qingcui Bu, Shu Zhang, Huanyu Wang, Gang Chen, Chengmo Zhang, Ju Guan, G. F. Wang, Xiang Ma, Zhi Zhang, Youli Tuo, Qi-Bin Yi, Y. P. Chen, Y. N. Liu, Zhi Chang, He Xu, Li Chen, ZiJian Li, Ying Tan, L. Sun, Bai-Sheng Liu, Fangjun Lu, He Gao, Mei Wu, Fan Zhang, Jia Huo, Gang Li, Xian Li, Hongwei Liu, Sheng Yang, Yu-Xuan Zhu, Luhua Jiang, Yongjie Zhang, Lian Tao, Wei Cui, Juan Zhang, Shuang-Nan Zhang, Aimei Zhang, GuoQing Liu, Yu-Dong Gu, Zheng-Wei Li, Wenshuai Wang, ShaoZhen Liu, L. D. Kong, LinLi Yan, Yanji Yang, Yi Zhang, Yuan Liu, and Zi-Liang Zhang

Subjects
Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, law.invention, Telescope, law, 0103 physical sciences, Calibration, Demodulation, Ground segment, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Remote sensing, media_common, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Payload, Astrophysics::Instrumentation and Methods for Astrophysics, Sky, Satellite, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Gamma-ray burst
Abstract

As China's first X-ray astronomical satellite, the Hard X-ray Modulation Telescope (HXMT), which was dubbed as Insight-HXMT after the launch on June 15, 2017, is a wide-band (1-250 keV) slat-collimator-based X-ray astronomy satellite with the capability of all-sky monitoring in 0.2-3 MeV. It was designed to perform pointing, scanning and gamma-ray burst (GRB) observations and, based on the Direct Demodulation Method (DDM), the image of the scanned sky region can be reconstructed. Here we give an overview of the mission and its progresses, including payload, core sciences, ground calibration/facility, ground segment, data archive, software, in-orbit performance, calibration, background model, observations and some preliminary results., 29 pages, 40 figures, 6 tables, to appear in Sci. China-Phys. Mech. Astron. arXiv admin note: text overlap with arXiv:1910.04434

Published
2020
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9. Insight-HXMT observations of Swift J0243.6+6124 during its 2017-2018 outburst

Author

Min-Xue Fu, Yanguo Li, Y. N. Liu, Li-Ming Song, Yu-Sa Wang, Jianling Zhao, Wan-Chang Zhang, Victor Doroshenko, Wei Zhang, Xue-Feng Lu, Xiaobo Li, Zi-Liang Zhang, Cheng-Cheng Guo, Da-Wei Han, YongJie Jin, He Xu, C. L. Zou, C. L. Zhang, HongMei Zhang, Guang-Cheng Xiao, Yongwei Dong, Juan Zhang, Yifei Zhang, Li Chen, Can Güngör, ZiJian Li, Yue Zhang, ShaoZhen Liu, Jin-Yuan Liao, ChunLei Zhang, Jianyin Nie, Jing-Kang Deng, Shu Zhang, Yu-Dong Gu, Wei Hu, Tong Zhang, Ming-Yu Ge, Xiao-Jing Liu, Y. Nang, LuHua Jiang, Jin-Lu Qu, M. Gao, Yue Zhu, Xufang Li, J. W. Yang, Bo Lu, Xiao-Fan Zhao, Cheng-Kui Li, Ju Guan, Youli Tuo, Huanyu Wang, Changsheng Shi, T. Luo, Andrea Santangelo, G. F. Wang, Xiang Ma, Yongjie Zhang, N. Sai, Zheng-Wei Li, Hai-Sheng Zhao, W. C. Jiang, Bin Meng, Lian Tao, Gang Chen, Wei-Wei Cui, Ying Tan, Yue Huang, Shaolin Xiong, Tian-Xiang Chen, Wei Li, Zhao Zhang, Guan-Hua Gao, Shu-Mei Jia, Bobing Wu, W. Z. Zhang, W. S. Wang, Zhi Chang, Ge Ou, Liang Sun, Y. P. Chen, C. X. Liu, Bing Li, Yupeng Xu, Jing Jin, WenHui Tao, Juan Wang, H. T. Liu, Mao-Shun Li, L. L. Yan, ShiJie Zheng, Yanji Yang, Yuan-Yuan Du, Mei Wu, XiangYang Wen, Yi Zhang, Xian Li, Sheng Yang, Wei Cui, GuoQing Liu, Jia Huo, Yuan Liu, Gang Li, Long Ji, X. H. Liang, He Gao, Shuang-Nan Zhang, Aimei Zhang, Yong Chen, Fan Zhang, and Yu-Xuan Zhu

Subjects
Physics, Swift, High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Accretion (astrophysics), Accretion disc, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena, computer, Astrophysics::Galaxy Astrophysics, computer.programming_language
Abstract

The recently discovered neutron star transient Swift J0243.6+6124 has been monitored by {\it the Hard X-ray Modulation Telescope} ({\it Insight-\rm HXMT). Based on the obtained data, we investigate the broadband spectrum of the source throughout the outburst. We estimate the broadband flux of the source and search for possible cyclotron line in the broadband spectrum. No evidence of line-like features is, however, found up to $\rm 150~keV$. In the absence of any cyclotron line in its energy spectrum, we estimate the magnetic field of the source based on the observed spin evolution of the neutron star by applying two accretion torque models. In both cases, we get consistent results with $B\rm \sim 10^{13}~G$, $D\rm \sim 6~kpc$ and peak luminosity of $\rm >10^{39}~erg~s^{-1}$ which makes the source the first Galactic ultraluminous X-ray source hosting a neutron star., published

Published
2019
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10. Optical optimization for anti-coincidence detectors of a Hard X-ray Modulation Telescope

Author

Zhao Zhang, Yun-Long Li, Min-Xue Fu, Ren-cheng Shang, Chen Zhang, Y. P. Chen, Dong-Hua Zhao, and Jing-Kang Deng

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, Cosmic ray, Phosphor, Reflector (antenna), Scintillator, 01 natural sciences, Electromagnetic radiation, law.invention, Telescope, Optics, Modulation, law, 0103 physical sciences, Optoelectronics, business, 010303 astronomy & astrophysics, Instrumentation
Abstract

The anti-coincidence detectors of Hard X-ray Modulation Telescope (HXMT) are designed to suppress the X-ray background induced by incident charged cosmic-ray particles. The main components of anti-coincidence detectors are thin flat plastic scintillators. In this work we apply the TracePro program to study the light transfer features in the scintillators, and we propose several optimized reflector configurations to significantly improve the light transfer efficiency. The simulation results are verified by measurements of the detector prototypes. We chose a particular optimized reflector configuration.

Published
2016
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