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arXiv 2501.06013astro-ph.HE
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利用Insight-HXMT观测对Be/X射线双星EXO 2030+375进行时间与能谱研究

Timing and spectral studies of the Be/X-ray binary EXO 2030+375 using Insight-HXMT observations

Institut für Astronomie und Astrophysik, Universität Tübingen(蒂宾根大学天文与天体物理研究所);ISDC Data Center for Astrophysics, Université de Genève(日内瓦大学天体物理学数据中心);School of Physics and Astronomy, Sun Yat-Sen University(中山大学物理学院);Institute of Astrophysics, Central China Normal University(华中师范大学天体物理研究所)

Yu-Jia Du, Lorenzo Ducci, Long Ji, Qing-Cui Bu, Ling-Da Kong, Peng-Ju Wang, Youli Tuo, Andrea Santangelo

AI总结:

利用Insight-HXMT观测,研究EXO 2030+375在2021年爆发期间的X射线能谱和时间特性,揭示其临界亮度及吸积态转变过程。

摘要:

我们报告了基于Insight-HXMT观测数据,对高质量X射线双星EXO 2030+375在2021年II型爆发期间的X射线能谱和时间分析。在1-150 keV能量范围内可以检测到脉动。脉冲轮廓显示能量和亮度依赖性及变化性。我们在爆发上升和衰减阶段观测到脉冲轮廓形状的转变。脉冲分数与亮度呈反相关,并且具有非单调的能量依赖性,在爆发峰值附近可能在30 keV处出现低谷。硬度-强度图(7-10 keV/4-7 keV)表明在爆发早期和晚期阶段发生了状态转变。这些转变与脉冲轮廓形状变化时的亮度一致,揭示了源达到临界亮度并从超临界和亚临界吸积态之间过渡的过程。我们进行了平均和相分辨能谱分析,其中流量分辨的平均能谱显示了亮度稳定的能谱演变。相分辨能谱分析揭示了谱参数对脉冲相位的依赖性随不同亮度而变化。

英文摘要:

We report the X-ray spectral and timing analysis of the high mass X-ray binary EXO 2030+375 during the 2021 type-II outburst based on the Insight-HXMT observations. Pulsations can be detected in the energy band of 1-150 keV. The pulse profile shows energy and luminosity dependence and variability. We observed transitions in the pulse profile shape during the rising and the decaying phase of the outburst. The pulse fraction exhibits an anti-correlation with luminosity and a non-monotonic energy dependence, with a possible dip near 30 keV during the outburst peak. The hardness-intensity diagrams (7-10 keV/4-7 keV) suggest state transitions during the early and late phases of the outburst. These transitions are consistent with the luminosity at which the pulse profile shape changes occur, revealing the source reaching the critical luminosity and transitioning between super-critical and sub-critical accretion regimes. We performed the average and phase-resolved spectral analysis, where the flux-resolved average spectra show a stable spectral evolution with luminosity. The phase-resolved spectral analysis reveals that the dependence of spectral parameters on the pulse phase varies with different luminosities.

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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