Peculiar disk behaviors of the black hole candidate MAXI J1348-630 in the hard state observed by Insight-HXMT and Swift
W. Zhang, L. Tao, R. Soria, J. L. Qu, S. N. Zhang, S. S. Weng, L. zhang, Y. N. Wang, Y. Huang, R. C. Ma, S. Zhang, M. Y. Ge, L. M. Song, X. Ma, Q. C. Bu, C. Cai… 展开作者
W. Zhang, L. Tao, R. Soria, J. L. Qu, S. N. Zhang, S. S. Weng, L. zhang, Y. N. Wang, Y. Huang, R. C. Ma, S. Zhang, M. Y. Ge, L. M. Song, X. Ma, Q. C. Bu, C. Cai, X. L. Cao, Z. Chang, L. Chen, T. X. Chen, Y. B. Chen, Y. Chen, Y. P. 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, L. D. Kong, B. Li, C. K. Li, G. Li, T. P. Li, W. Li, X. Li, X. B. Li, X. F. Li, Z. W. Li, X. H. Liang, J. Y. Liao, B. S. Liu, C. Z. Liu, H. X. Liu, H. W. Liu, X. J. Liu, F. J. Lu, X. F. Lu, Q. Luo, T. Luo, B. Meng, Y. Nang, J. Y. Nie, G. Ou, X. Q. Ren, N. Sai, X. Y. Song, L. Sun, Y. Tan, Y. L. Tuo, C. Wang, L. J. Wang, P. 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, Y. P. Chen, R. J. Yang, S. Yang, Y. J. Yang, Y. R. Yang, Q. B. Yi, Q. Q. Yin, Y. Yuan, F. Zhang, H. M. Zhang, P. Zhang, W. C. Zhang, Y. F. Zhang, Y. H. Zhang, H. S. Zhao, X. F. Zhao, S. J. Zheng, Y. G. Zheng, D. K. Zhou
We present a spectral study of the black hole candidate MAXI J1348-630 during its 2019 outburst, based on monitoring observations with Insight-HXMT and Swift. Throughout the outburst, the spectra are well fitted with power-law plus disk-blackbody components. In the soft-intermediate and soft states, we observed the canonical relation L ~ T_in^4 between disk luminosity L and peak colour temperature T_in, with a constant inner radius R_in (traditionally identified with the innermost stable circular orbit). At other stages of the outburst cycle, the behaviour is more unusual, inconsistent with the canonical outburst evolution of black hole transients. In particular, during the hard rise, the apparent inner radius is smaller than in the soft state (and increasing), and the peak colour temperature is higher (and decreasing). This anomalous behaviour is found even when we model the spectra with self-consistent Comptonization models, which take into account the up-scattering of photons from the disk component into the power-law component. To explain both those anomalous trends at the same time, we suggest that the hardening factor for the inner disk emission was larger than the canonical value of ~1.7 at the beginning of the outburst. A more physical trend of radii and temperature evolution requires a hardening factor evolving from ~3.5 at the beginning of the hard state to ~1.7 in the hard intermediate state. This could be evidence that the inner disk was in the process of condensing from the hot, optically thin medium and had not yet reached a sufficiently high optical depth for its emission spectrum to be described by the standard optically-thick disk solution.
Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
我们研究了吸积中的黑洞双星MAXI J1820+070的硬态X射线和软γ射线谱。我们对HXMT、NuSTAR和INTEGRAL的联合光谱进行了分析。我们发现所有三颗卫星的光谱之间存在总体一致性。令人满意的适合的数据需要大量的光谱复杂性，我们的模型包括两个康普顿化区域和相关的磁盘反射，磁盘黑体和窄Fe K $α$线。我们的拟合证实了至少在$>$ 10引力半径处存在反射光学厚盘的截断。然而，我们发现，HXMT数据本身不能显着约束磁盘内半径。
Multi-band power color-color diagrams of three black hole X-ray binaries observed with Insight-HXMT
School of Physics and Astronomy, Sun Yat-sen University（中山大学物理学院）；CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area（中国空间站科学中心粤港澳大湾区分中心）；Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台光学天文重点实验室）
Search for the Highest-energy Quasiperiodic Oscillation in the Black Hole X-Ray Binary Candidate Swift J1727.8-1613
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所粒子天体物理重点实验室）；University of Chinese Academy of Sciences, Chinese Academy of Sciences（中国科学院大学）
The prolific thermonuclear X-ray bursts from the outburst of the newly discovered millisecond pulsar MAXI~J1816--195 observed by Insight-HXMT and NICER
Evolution of the Inner Accretion Flow in Swift J1727.8$-$1613 across Intermediate States: Insights from Broadband Spectral and Timing Analysis
Inter-University Centre for Astronomy and Astrophysics（天文与天体物理大学间中心）；Institute of Astronomy, National Tsing Hua University（国立清华大学天文研究所）；Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（波兰科学院尼古拉·哥白尼天文学中心）；Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya (A Central University)（古鲁·加西达斯维什瓦维迪亚亚拉（一所中央大学）纯与应用物理系）
Revisiting the 2021 Outburst of the BHC MAXI J1803-298 Using NICER, NuSTAR, and Insight-HXMT Data
South-Western Institute for Astronomy Research, Yunnan University（西南天体物理研究所，云南大学）；Indian Center for Space Physics（印度空间物理中心）；Institute of Astronomy, National Tsing Hua University（国立清华大学天文研究所）
Broad-band spectral-timing: simultaneous NICER and HXMT observations reveal an anticorrelation between the softest and hardest X-ray fluxes in MAXI J1820+070
Anton Pannekoek Institute for Astronomy（安东·潘内科克天文学研究所）；Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics（卡尔·雷米斯天文台与埃尔朗根高能粒子物理中心）；School of Physics and Technology, Wuhan University（武汉大学物理科学与技术学院）
Bridging X-ray Polarization with Timing & Spectroscopic Parameters of a galactic black hole: Swift J1727.8-1613
National Tsing Hua University（国立清华大学）；Yunnan University（云南大学）；Rishi Bankim Chandra College（里希·班金·昌德拉学院）；University of Manitoba（曼尼托巴大学）；Aryabhatta Research Institute of Observational Sciences（阿亚博哈塔观测科学研究所）
The Broadband X-ray Spectral Properties during the Rising Phases of the Outburst of the New Black Hole X-ray Binary Candidate Swift J1727.8-1613
QingHai University（青海大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；Dongguan Neutron Science Center（东莞中子科学中心）；University of Chinese Academy of Sciences（中国科学院大学）
Dynamic disk-corona coupling during the state transition of Swift J1727.8-1613
Wuhan University（武汉大学）；Nanjing University（南京大学）；Shanghai Astronomical Observatory, Chinese Academy of Sciences (CAS)（中国科学院上海天文台）；Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（波兰科学院尼古拉·哥白尼天文学中心）
Characteristics of the High-frequency Humps in the Black hole X-ray Binary Swift J1727.8--1613
Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（高能物理研究所粒子天体物理重点实验室）；University of Chinese Academy of Sciences, Chinese Academy of Sciences（中国科学院大学）
Evolution of Time-Lags of Swift J1727.8-1613 during the Rising Phase of Its Discovery Outburst
Indian Center for Space Physics（印度空间物理中心）；Institute of Astronomy, National Tsing Hua University（国立清华大学天文研究所）；Institute of Astronomy Space and Earth Science（天文、太空与地球科学研究所）；Department of Physics, National Tsing Hua University（国立清华大学物理系）
