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26 April 2024

» arxiv » 1910.8220

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Insight-HXMT observation on 4U~1608--52: evolving spectral properties of a bright type-I X-ray burst
Y. P. Chen ; S. Zhang ; S. N. Zhang ; L. Ji ; L. D. Kong ; A. Santangelo ; J. L. Qu ; F. J. Lu ; T. P. Li ; L. M. Song ; Y. P. Xu ; X. L. Cao ; Y. Chen ; C. Z. Liu ; Q. C. Bu ; C. Cai ; Z. Chang ; G. Chen ; L. Chen ; T. X. Chen ; Y. B. Chen ; W. Cui ; W. W. Cui ; J. K. Deng ; Y. W. Dong ; Y. Y. Du ; M. X. Fu ; G. H. Gao ; H. Gao ; M. Gao ; M. Y. Ge ; Y. D. Gu ; J. Guan ; C. C. Guo ; D. W. Han ; Y. Huang ; J. Huo ; S. M. Jia ; L. H. Jiang ; W. C. Jiang ; J. Jin ; B. Li ; C. K. Li ; G. Li ; M. S. Li ; W. Li ; X. Li ; X. B. Li ; X. F. Li ; Y. G. Li ; Z. W. Li ; X. H. Liang ; J. Y. Liao G. Q. Liu ; H. W. Liu ; X. J. Liu ; Y. N. Liu ; B. Lu ; X. F. Lu ; Q. Luo ; T. Luo ; X. Ma ; B. Meng ; Y. Nang ; J. Y. Nie ; G. Ou ; N. Sai ; L. Sun ; Y. Tan ; L. Tao ; Y. L. Tuo ; C. Wang ; G. F. Wang ; 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 ; J. W. Yang ; S. Yang ; Yang-Ji Yang ; Yi-Jung Yang ; Q. B. Yi ; Q. Q. Yin ; Y. You ; A. M. Zhang ; C. L. Zhang ; C. M. Zhang ; F. Zhang ; H. M. Zhang ; J. Zhang ; T. Zhang ; W. C. Zhang ; W. Zhang ; W. Z. Zhang ; Yi. Zhang ; Y. F. Zhang ; Y. J. Zhang ; Yue. Zhang ; Z. Zhang ; Z. L. Zhang ; H. S. Zhao ; X. F. Zhao ; S. J. Zheng ; D. K. Zhou ; J. F. Zhou ; Y. Zhu ; Y. X. Zhu ;
Date:	18 Oct 2019
Abstract:	The evidences for the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environments in neutron star low-mass X-ray binaries (LMXB) were detected previously via spectral and timing analyses. Benefitting from a broad energy coverage of Insight-HXMT, we analyze one photospheric radius expansion (PRE) burst, and find an emission excess at soft X-rays. Our spectral analysis shows that, such an excess is not likely relevant to the disk reflection induced by the burst emission and can be attributed to an enhanced pre-burst/persistent emission. We find that the burst and enhanced persistent emissions sum up to exceed Eddington luminosity by $sim$ 40 percentages. We speculate that the enhanced emission is from a region beyond the PRE radius, or through the Comptonization of the corona.
Source:	arXiv, 1910.8220
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