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Your search keyword '"H. S. Zhao"' showing total 2 results
Start Over Author "H. S. Zhao" Publisher oxford university press (oup)
2 results on '"H. S. Zhao"'

1. The 2018 failed outburst of H 1743 – 322: Insight-HXMT, NuSTAR, and NICER views

Author

P J Wang, L D Kong, Y P Chen, S Zhang, S N Zhang, R Soria, L Ji, J L Qu, Y Huang, L Tao, M Y Ge, F J Lu, L Chen, T P Li, Y P Xu, X L Cao, Y Chen, C Z Liu, Q C Bu, C Cai, Z Chang, T X Chen, Y B Chen, W W Cui, Y Y Du, G H Gao, H Gao, Y D Gu, J Guan, C C Guo, D W Han, J Huo, S M Jia, W C Jiang, J Jin, B Li, C K Li, G Li, W Li, X Li, X B Li, X F Li, Z W Li, X H Liang, J Y Liao, B S Liu, H X Liu, H W Liu, X J Liu, X F Lu, Q Luo, T Luo, R C Ma, X Ma, B Meng, Y Nang, J Y Nie, G Ou, X Q Ren, N Sai, L M Song, X Y Song, L Sun, Y Tan, Y L Tuo, C Wang, L J Wang, W S Wang, Y S Wang, X Y Wen, B Y Wu, B B Wu, M Wu, G C Xiao, S Xiao, S L Xiong, R J Yang, S Yang, Yan Ji Yang, Yi Jung Yang, Q B Yi, Q Q Yin, Y You, F Zhang, H M Zhang, J Zhang, P Zhang, W C Zhang, W Zhang, Y F Zhang, Y H Zhang, H S Zhao, X F Zhao, S J Zheng, Y G Zheng, and D K Zhou

Subjects
Space and Planetary Science, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics
Abstract

We studied the 2018 outburst of the black hole transient H 1743 − 322 with a series of Insight-HXMT, NICER, and NuSTAR observations, covering the 1–120 keV band. With our broad-band X-ray spectral modelling, we confirm that the source remained in the low/hard state throughout the month-long outburst, although it became marginally softer at peak flux. We detected Type-C quasi-periodic oscillations (QPOs) and followed the evolution of their properties. The QPO frequency increased from ∼0.1 to ∼0.4 Hz during the rising phase of the outburst and decreased again in the decline. Continuum X-ray flux, power-law photon index, QPO frequency, and QPO root-mean-square amplitude were positively correlated. The QPO amplitude was slightly higher in the soft X-ray band (typical values of 12–16 per cent, compared with 8–10 per cent in the hard band). Our spectral-timing results shed light on the initial rising phase in the low/hard state, which has rarely been monitored with such high cadence, time resolution, and broad-band coverage. Combining spectral and timing properties, we find that ‘failed’ (hard state only) and ‘successful’ outbursts follow the same initial evolutionary track, although the former class of outburst never reaches the threshold for a transition to softer (thermally dominated) accretion regimes.

Published
2022

2. Physical origin of the non-physical spin evolution of MAXI J1820 + 070

Author

Cunguo Wang, Shaolin Xiong, B. S. Liu, B. B. Wu, H. Gao, J. Y. Liao, H. M. Zhang, R. C. Ma, Y. S. Wang, Y. F. Zhang, Xue-Feng Lu, C. Cai, Lian Tao, Shuinai Zhang, Tong Li, G. H. Gao, S. M. Jia, Tao Luo, M. Wu, X. Y. Song, Bo Li, Wenxiong Li, J. Jin, Xin-Fu Zhao, He-Yang Liu, S. Xiao, Lei Sun, Junqiang Zhang, J. L. Qu, Y. H. Tan, C. K. Li, Y. Nang, Peng Zhang, R. J. Yang, H. W. Liu, N. Sai, Yuan-Yuan Du, Y. G. Zheng, X. X. Li, Z. Chang, Y. B. Chen, Qiu-Yi Luo, Tian-Xiang Chen, Z. W. Li, F. J. Lu, Qingcui Bu, L. M. Song, S. J. Zheng, XiangYang Wen, X. H. Ma, Da-Wei Han, Ya Fang Huang, H. S. Zhao, Yuan You, Qi-Bin Yi, D. K. Zhou, P. J. Wang, W. S. Wang, Ge Ou, Yi Zhang, C. Z. Liu, Sisi Yang, J. Y. Nie, Xin Ren, Liang Zhang, Cheng-Cheng Guo, Ming-Yu Ge, L. Chen, Wan-Chang Zhang, Xiong Li, Yu-Dong Gu, X. J. Liu, Libin Wang, X. L. Cao, Q. Q. Yin, Y. P. Chen, Y. Wang, X. H. Liang, Fuqin Zhang, S. N. Zhang, Y. P. Xu, B. Y. Wu, Xuelong Li, J. Guan, L. D. Kong, Wei Cui, W. C. Zhang, Jia Huo, Gang Li, Wenhan Jiang, Bin Meng, Y. J. Yang, and G. C. Xiao

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Hardness ratio, Astrophysics::High Energy Astrophysical Phenomena, Spin transition, FOS: Physical sciences, Binary number, Astronomy and Astrophysics, Astrophysics, Black hole, Innermost stable circular orbit, Accretion disc, Space and Planetary Science, Coincident, Spectral analysis, 83C57, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract

We report on the Insight-HXMT observations of the new black hole X-ray binary MAXI J1820+070 during its 2018 outburst. Detailed spectral analysis via the continuum fitting method shows an evolution of the inferred spin during its high soft sate. Moreover, the hardness ratio, the non-thermal luminosity and the reflection fraction also undergo an evolution, exactly coincident to the period when the inferred spin transition takes place. The unphysical evolution of the spin is attributed to the evolution of the inner disc, which is caused by the collapse of a hot corona due to condensation mechanism or may be related to the deceleration of a jet-like corona. The studies of the inner disc radius and the relation between the disc luminosity and the inner disc radius suggest that, only at a particular epoch, did the inner edge of the disc reach the innermost stable circular orbit and the spin measurement is reliable. We then constrain the spin of MAXI J1820+070 to be a*=0.2^{+0.2}_{-0.3}. Such a slowly spinning black hole possessing a strong jet suggests that its jet activity is driven mainly by the accretion disc rather than by the black hole spin., Comment: 14 pages, 13 figures, 5 tables, accepted for publication in MNRAS

Published
2021

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