Timing analysis of 2S 1417-624 observed with NICER and Insight-HXMT
Long Ji, Victor Doroshenko, A. Santangelo, Can Güngör(Sabancı Üniversitesi), Shuo Zhang(Institute of High Energy Physics), L. Ducci(University of Geneva), S. N. Zhang(Institute of High Energy Physics), M-Y Ge(Institute of High Energy Physics), Liu-qing Qu(Institute of High Energy Physics), Y. P. Chen(Institute of High Energy Physics), Qingcui Bu(Institute of High Energy Physics), X. L. Cao(Institute of High Energy Physics), Zhi Chang(Institute of High Energy Physics), G Chen(Institute of High Energy Physics), Lei Chen(Beijing Normal University), T X Chen(Institute of High Energy Physics), Y. Chen(Institute of High Energy Physics), Y. B. Chen(Institute of High Energy Physics), Wei Cui(Institute of High Energy Physics), Wei Cui(Institute of High Energy Physics), J. K. Deng(Tsinghua University), Yongwei Dong(Institute of High Energy Physics), Yuanyuan Du(Institute of High Energy Physics), Mingye Fu(Tsinghua University), G. H. Gao(Institute of High Energy Physics), H. Gao(Institute of High Energy Physics), M. Gao(Institute of High Energy Physics), Yun-Jun Gu(Institute of High Energy Physics), Ju Guan(Institute of High Energy Physics), Chengcheng Guo(Institute of High Energy Physics), Danxiang Han(Institute of High Energy Physics), W. Hu(Institute of High Energy Physics), Y. Huang(Institute of High Energy Physics), J. Huo(Institute of High Energy Physics), S. M. Jia(Institute of High Energy Physics), Luhua Jiang(Institute of High Energy Physics), Weichun Jiang(Institute of High Energy Physics), Jing Jin(Institute of High Energy Physics), Y J Jin(Institute of High Energy Physics), Ling-Da Kong(Institute of High Energy Physics), Bing Li(Institute of High Energy Physics), C K Li(Institute of High Energy Physics), Gang Li(Institute of High Energy Physics), M. S. Li(Institute of High Energy Physics), T. P. Li(Institute of High Energy Physics), W Li(Institute of High Energy Physics), Xin Li(Institute of High Energy Physics), X B Li(Institute of High Energy Physics), X. F. Li(Institute of High Energy Physics), Yong Li(Institute of High Energy Physics), Zhangjian Li(Institute of High Energy Physics), Zhi Li(Institute of High Energy Physics), X. H. Liang(Institute of High Energy Physics), J. Y. Liao(Institute of High Energy Physics), Chenjie Liu(Institute of High Energy Physics), Gang Liu(Tsinghua University), H. W. Liu(Institute of High Energy Physics), S Z Liu(Institute of High Energy Physics), Xi Liu(Institute of High Energy Physics), Ying Liu(Institute of High Energy Physics), Y. N. Liu(Institute of High Energy Physics), Bo Lü(Institute of High Energy Physics), F. J. Lu(Institute of High Energy Physics), X. F. Lu(Institute of High Energy Physics), T. Luo(Institute of High Energy Physics), Xiang Ma(Institute of High Energy Physics), Bin Meng(Institute of High Energy Physics), Y. Nang(Institute of High Energy Physics), J. Y. Nie(Institute of High Energy Physics), G. Ou(Institute of High Energy Physics), Na Sai(Institute of High Energy Physics), L. M. Song(Institute of High Energy Physics), X. Y. Song(Institute of High Energy Physics), Luming Sun(Institute of High Energy Physics), Y. H. Tan(Institute of High Energy Physics), Lian Tao(Institute of High Energy Physics), Y. L. Tuo(Institute of High Energy Physics), G. F. Wang(Institute of High Energy Physics), Juan Wang(Institute of High Energy Physics), W. S. Wang(Institute of High Energy Physics), Yutao Wang(Institute of High Energy Physics), X. Y. Wen(Institute of High Energy Physics), Bobing Wu(Institute of High Energy Physics), M. H. Wu(Institute of High Energy Physics), G. Xiao(Institute of High Energy Physics), S. L. Xiong(Institute of High Energy Physics), He Xu(Institute of High Energy Physics), Y. P. Xu(Institute of High Energy Physics), Yanji Yang(Institute of High Energy Physics), Yi-Jung Yang(Institute of High Energy Physics), S. Yang(Institute of High Energy Physics), Yi-Jung Yang(Institute of High Energy Physics), A M Zhang(Institute of High Energy Physics), C. L. Zhang(Institute of High Energy Physics), C. M. Zhang(Institute of High Energy Physics), F Zhang(Institute of High Energy Physics), H M Zhang(Institute of High Energy Physics), Jered Y. Zhang(Institute of High Energy Physics), Q. Zhang(Institute of High Energy Physics), Tong Zhang(Institute of High Energy Physics), W. Zhang(Beijing Normal University), W C Zhang(Beijing Normal University), W. Z. Zhang(Beijing Normal University), Y Zhang(Institute of High Energy Physics), Yi Zhang(Institute of High Energy Physics), Y F Zhang(Institute of High Energy Physics), Yajiu Zhang(Institute of High Energy Physics), Zhisen Zhang(Institute of High Energy Physics), Z L Zhang(Institute of High Energy Physics), Haisheng Zhao(Institute of High Energy Physics), Jianling Zhao(Institute of High Energy Physics), Xiaofan Zhao(Institute of High Energy Physics), S. J. Zheng(Institute of High Energy Physics), Yuxuan Zhu(Institute of High Energy Physics), Yuxuan Zhu(Institute of High Energy Physics), Chunpeng Zou(Institute of High Energy Physics)
Cited by 13Open Access
Abstract
Abstract We present a study of timing properties of the accreting pulsar 2S 1417-624 observed during its 2018 outburst, based on Swift/BAT, Fermi/GBM, Insight-HXMT and NICER observations. We report a dramatic change of the pulse profiles with luminosity. The morphology of the profile in the range 0.2-10.0 keV switches from double to triple peaks at ∼2.5 $\rm \times 10^{37}{\it D}_{10}^2\ erg\ s^{-1}$ and from triple to quadruple peaks at ∼7 $\rm \times 10^{37}{\it D}_{10}^2\ erg\ s^{-1}$. The profile at high energies (25-100 keV) shows significant evolutions as well. We explain this phenomenon according to existing theoretical models. We argue that the first change is related to the transition from the sub to the super-critical accretion regime, while the second to the transition of the accretion disc from the gas-dominated to the radiation pressure-dominated state. Considering the spin-up as well due to the accretion torque, this interpretation allows to estimate the magnetic field self-consistently at ∼7 × 1012 G.
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