论文标题
GX 339-4的迅速交替通量状态在其2021年爆发中由Insight-HXMT捕获
Rapidly alternating flux states of GX 339-4 during its 2021 outburst captured by Insight-HXMT
论文作者
论文摘要
低质量X射线二进制二进制GX 339-4在2021年爆发了新的爆发。在这种爆发的难以软过渡结束时，Insight-HXMT发现，源在小时的时间尺度上迅速交替在低通量和高通量状态之间。两个高通量状态仅持续了一段时间，与天文台的轨道时期相当。时间分辨的光谱分析表明，磁通的突然变化限制在硬X射线带中（> 4 keV）。可变的非热发射，包括电晕的幂律连续体以及内部积聚磁盘的反射发射，是造成观察到的可变性的原因。两个通量状态之间，磁盘热发射的强度和积聚盘的内半径是一致的。假设灯柱几何形状，我们最适合的磁盘反射模型表明，电晕高度（3 $ r _ {\ rm g} $之内），并且也没有证据表明Corona几何形状也有显着差异。观察到的快速交替的通量状态表明，在状态过渡期间，电晕的内在力必须改变。我们讨论了观察到的GX 339-4冠状力突然变化的可能机制。
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.
