Hot disk of the Swift J0243.6+6124 revealed by Insight-HXMT
Victor Doroshenko(Space Research Institute), S. N. Zhang(Chinese Academy of Sciences), A. Santangelo(Max Planck Institute for Astrophysics), Long Ji(Max Planck Institute for Astrophysics), Sergey S. Tsygankov(University of Turku), Alexander A. Mushtukov(Leiden University), Liu-qing Qu(Chinese Academy of Sciences), S Zhang(Chinese Academy of Sciences), M. Y. Ge(Chinese Academy of Sciences), Yupeng Chen(Chinese Academy of Sciences), Qingcui Bu(Chinese Academy of Sciences), X. L. Cao(Chinese Academy of Sciences), Zhi Chang(Chinese Academy of Sciences), G. Chen(Chinese Academy of Sciences), L Chen(Beijing Normal University), T X Chen(Chinese Academy of Sciences), Yong Chen(Chinese Academy of Sciences), Y B Chen(Chinese Academy of Sciences), Wei Cui(Chinese Academy of Sciences), Wei Cui(Chinese Academy of Sciences), J. K. Deng(Tsinghua University), Yongwei Dong(Chinese Academy of Sciences), Yuanyuan Du(Chinese Academy of Sciences), Mingye Fu(Tsinghua University), G. H. Gao(Chinese Academy of Sciences), H. Gao(Chinese Academy of Sciences), M. Gao(Chinese Academy of Sciences), Yun-Jun Gu(Chinese Academy of Sciences), Ju Guan(Chinese Academy of Sciences), Chengcheng Guo(Chinese Academy of Sciences), Danxiang Han(Chinese Academy of Sciences), W. Hu(Chinese Academy of Sciences), Y. Huang(Chinese Academy of Sciences), J. Huo(Chinese Academy of Sciences), S. M. Jia(Chinese Academy of Sciences), Luhua Jiang(Chinese Academy of Sciences), Weichun Jiang(Chinese Academy of Sciences), Jing Jin(Chinese Academy of Sciences), Yuchen Jin(Tsinghua University), Ling-Da Kong(Chinese Academy of Sciences), Bing Li(Chinese Academy of Sciences), Cheng-Kui Li(Chinese Academy of Sciences), Gang Li(Chinese Academy of Sciences), M. S. Li(Chinese Academy of Sciences), T. P. Li(Chinese Academy of Sciences), W Li(Chinese Academy of Sciences), Xinyue Li(Chinese Academy of Sciences), X B Li(Chinese Academy of Sciences), X F Li(Chinese Academy of Sciences), Yong Li(Chinese Academy of Sciences), Zhangjian Li(Chinese Academy of Sciences), Zhifeng Li(Chinese Academy of Sciences), X. H. Liang(Chinese Academy of Sciences), J. Y. Liao(Chinese Academy of Sciences), Congzhan Liu(Chinese Academy of Sciences), G. Q. Liu(Tsinghua University), Haibo Liu(Chinese Academy of Sciences), S Z Liu(Chinese Academy of Sciences), Xuewei Liu(Chinese Academy of Sciences), Yuhan Liu(Chinese Academy of Sciences), Yongli Liu(Chinese Academy of Sciences), Bo Lü(Chinese Academy of Sciences), F. J. Lu(Chinese Academy of Sciences), X. F. Lu(Chinese Academy of Sciences), T. Luo(Chinese Academy of Sciences), Xiang Ma(Chinese Academy of Sciences), Bin Meng(Chinese Academy of Sciences), Y. Nang(Chinese Academy of Sciences), J. Y. Nie(Chinese Academy of Sciences), G. Ou(Chinese Academy of Sciences), Na Sai(Chinese Academy of Sciences), L. M. Song(Chinese Academy of Sciences), X. Y. Song(Chinese Academy of Sciences), Luming Sun(Chinese Academy of Sciences), Y. H. Tan(Chinese Academy of Sciences), Lian Tao(Chinese Academy of Sciences), Y. L. Tuo(Chinese Academy of Sciences), G. F. Wang(Chinese Academy of Sciences), J Wang(Chinese Academy of Sciences), W. S. Wang(Chinese Academy of Sciences), Y. S. Wang(Chinese Academy of Sciences), X. Y. Wen(Chinese Academy of Sciences), Bobing Wu(Chinese Academy of Sciences), M. Wu(Chinese Academy of Sciences), G. Xiao(Chinese Academy of Sciences), S. L. Xiong(Chinese Academy of Sciences), He Xu(Chinese Academy of Sciences), Y. P. Xu(Chinese Academy of Sciences), Yanji Yang(Chinese Academy of Sciences), Yi-Jung Yang(Chinese Academy of Sciences), S. Yang(Chinese Academy of Sciences), H. J. Yang(Chinese Academy of Sciences), A M Zhang(Chinese Academy of Sciences), C. L. Zhang(Chinese Academy of Sciences), Chengmin Zhang(Chinese Academy of Sciences), F Zhang(Chinese Academy of Sciences), Hongwei Zhang(Chinese Academy of Sciences), Jered Y. Zhang(Chinese Academy of Sciences), Q Zhang(Chinese Academy of Sciences), T. Zhang(Chinese Academy of Sciences), W Zhang(Chinese Academy of Sciences), W C Zhang(Chinese Academy of Sciences), W Z Zhang(Chinese Academy of Sciences), Y. Zhang(Chinese Academy of Sciences), Yuan Zhang(Chinese Academy of Sciences), Y F Zhang(Chinese Academy of Sciences), Yajiu Zhang(Chinese Academy of Sciences), Zihan Zhang(Chinese Academy of Sciences), Z L Zhang(Chinese Academy of Sciences), Hai-Hui Zhao(Chinese Academy of Sciences), Jianling Zhao(Chinese Academy of Sciences), Xiao-Yun Zhao(Chinese Academy of Sciences), S. J. Zheng(Chinese Academy of Sciences), Yuxuan Zhu(Chinese Academy of Sciences), Yuxuan Zhu(Chinese Academy of Sciences), Chunpeng Zou(Chinese Academy of Sciences)
Cited by 46Open Access
Abstract
Abstract We report on analysis of observations of the bright transient X-ray pulsar Swift J0243.6+6124 obtained during its 2017-2018 giant outburst with Insight-HXMT, NuSTAR, and Swift observatories. We focus on the discovery of a sharp state transition of the timing and spectral properties of the source at super-Eddington accretion rates, which we associate with the transition of the accretion disk to a radiation pressure dominated (RPD) state, the first ever directly observed for magnetized neutron star. This transition occurs at slightly higher luminosity compared to already reported transition of the source from sub- to super-critical accretion regime associate with onset of an accretion column. We argue that this scenario can only be realized for comparatively weakly magnetized neutron star, not dissimilar to other ultra-luminous X-ray pulsars (ULPs), which accrete at similar rates. Further evidence for this conclusion is provided by the non-detection of the transition to the propeller state in quiescence which strongly implies compact magnetosphere and thus rules out magnetar-like fields.
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