arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.08919astro-ph.HE
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4U 1901+03耀斑期间吸积结构之间的转换

Switches between accretion structures during flares in 4U 1901+03

L. Ji, L. Ducci, A. Santangelo, S. Zhang, V. Suleimanov, S. Tsygankov, V. Doroshenko, A. Nabizadeh, S. N. Zhang, M. Y. Ge, L. Tao, Q. C. Bu, J. L. Qu, F. J. Lu,… 展开作者

L. Ji, L. Ducci, A. Santangelo, S. Zhang, V. Suleimanov, S. Tsygankov, V. Doroshenko, A. Nabizadeh, S. N. Zhang, M. Y. Ge, L. Tao, Q. C. Bu, J. L. Qu, F. J. Lu, L. Chen, L. M. Song, T. P. Li, Y. P. Xu, X. L. Cao, Y. Chen, C. Z. Liu, C. Cai, Z. Chang, G. Chen, T. X. Chen, Y. B. Chen, Y. P. 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, 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, L. D. Kong, 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. X. 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, X. Q. Ren, N. Sai, X. Y. Song, L. Sun, Y. Tan, Y. L. Tuo, C. Wang, G. F. Wang, 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, J. W. Yang, S. Yang, Yan-Ji Yang, Yi-Jung Yang, Q. B. Yi, Q. Q. Yin, Y. You, A. M. Zhang, C. M. Zhang, F. Zhang, H. M. Zhang, J. Zhang, P. Zhang, T. Zhang, W. Zhang, W. C. Zhang, W. Z. Zhang, Yi Zhang, Y. F. Zhang, Y. J. Zhang, Y. H. Zhang, Yue Zhang, Z. Zhang, Z. L. Zhang, H. S. Zhao, X. F. Zhao, S. J. Zheng, D. K. Zhou, J. F. Zhou, Y. X. Zhu, Y. Zhu

摘要:

我们报告了我们对2019年X射线吸积脉冲星4U 1901+03爆发的分析,这些爆发是用Insight-HXMT和NICER观测到的。在爆发的衰减阶段,光谱和脉冲轮廓都有显著的演变。在整个爆发过程中观察到数十个耀斑。它们在爆发高峰时更频繁,更明亮。我们发现,耀斑,这有一个持续时间从几十到几百秒,一般是明亮的比持续发射的$\sim$ 1.5倍。耀斑期间的脉冲轮廓形状可以明显不同于持续发射的脉冲轮廓形状。特别地,在许多情况下清楚地观察到相移。我们解释这些发现的脉冲光束图案的变化,由于在短时间尺度上的亚和超临界吸积制度之间的过渡的直接证据。我们还观察到,在可比的光度耀斑的脉冲轮廓是相当相似的持久发射。这表明中子星极盖上的吸积主要由光度决定,即,质量增长率

英文摘要:

We report on our analysis of the 2019 outburst of the X-ray accreting pulsar 4U 1901+03 observed with Insight-HXMT and NICER. Both spectra and pulse profiles evolve significantly in the decaying phase of the outburst. Dozens of flares are observed throughout the outburst. They are more frequent and brighter at the outburst peak. We find that the flares, which have a duration from tens to hundreds of seconds, are generally brighter than the persistent emission by a factor of $\sim$ 1.5. The pulse profile shape during the flares can be significantly different than that of the persistent emission. In particular, a phase shift is clearly observed in many cases. We interpret these findings as direct evidence of changes of the pulsed beam pattern, due to transitions between the sub- and super-critical accretion regimes on a short time scale. We also observe that at comparable luminosities the flares' pulse profiles are rather similar to those of the persistent emission. This indicates that the accretion on the polar cap of the neutron star is mainly determined by the luminosity, i.e., the mass accretion rate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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