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arXiv 2202.04780astro-ph.HE
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由Insight-HXMT捕获的GX 339-4在2021年爆发期间的快速交替通量状态

Rapidly alternating flux states of GX 339-4 during its 2021 outburst captured by Insight-HXMT

Honghui Liu, Jiachen Jiang, Zuobin Zhang, Cosimo Bambi, Long Ji, Lingda Kong, Shu Zhang

摘要:

低质量X射线双星GX 339-4在2021年进入了一次新的爆发。在这次爆发的硬到软转变结束时,Insight-HXMT发现源在几个小时的时间尺度上在低通量和高通量状态之间迅速交替。两个高通量状态只持续了相当于观测站轨道周期的一段时间。时间分辨谱分析表明,通量突变局限于硬X射线波段(>4 keV)。可变的非热辐射,包括来自日冕的幂律连续体和来自内部吸积盘的反射辐射,是造成观测到的可变性的原因。两种流态的吸积盘热辐射强度和吸积盘内径一致。假设灯柱的几何形状,我们的最佳拟合磁盘反射模型表明一个非常低的日冕高度(3 $R_{\rm g}$内),也没有证据表明日冕几何形状的显着变化。观察到的快速交替的通量状态表明,电晕的固有功率必须改变在状态转换。我们讨论了观测到的GX 339-4日冕能量突然变化的可能机制。

英文摘要:

The low mass X-ray binary GX 339-4 went into a new outburst in 2021. At the end of the hard to soft transition of this outburst, Insight-HXMT found that the source rapidly alternated between low flux and high flux states on a timescale of hours. Two high flux states lasted only for a period comparable to the orbital period of the observatory. Time-resolved spectral analysis shows that the sudden changes of flux are confined in the hard X-ray band (>4 keV). The variable non-thermal emission, including the power-law continuum from the corona and the reflected emission from the inner accretion disk, is responsible for the observed variability. The strength of disk thermal emission and the inner radius of the accretion disk are consistent between the two flux states. Assuming the lamppost geometry, our best-fit disk reflection models suggest a very low corona height (within 3 $R_{\rm g}$) and there is no evidence of significant variation in the corona geometry either. The observed rapidly alternating flux states suggest that the intrinsic power of the corona must change during the state transition. We discuss possible mechanisms for the observed sudden changes in the coronal power of GX 339-4.

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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