Statistical analysis on X-ray flares from the nucleus and HST-1 knot in the M87 jet
Statistical analysis on X-ray flares from the nucleus and HST-1 knot in the M87 jet
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M87喷流中核和HST-1结的X射线耀斑统计分析
DOI：
10.1093/mnras/stz2302
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发表时间：
2019
影响因子：
4.8
通讯作者：
Li Zhang
中科院分区：
文献类型：
--
作者：
Shenbang Yang;Dahai Yan;Benzhong Dai;Pengfei Zhang;Qianqian Zhu;Jiancheng Wang;Li Zhang
研究了M87喷流中两个不同位置（核和HST-1）X射线耀斑的统计特性，以揭示耀斑的物理起源。我们分析档案钱德拉数据M87，并确定14个耀斑的核心和9个耀斑的HST-1。得到了每个耀斑的峰值强度（IP）和耀斑持续时间（Tfl）。结果表明，核的IP和Tfl的分布都服从指数相似的幂律形式。对HST-1也得到了类似的结果，并且在细胞核和HST-1之间没有发现明显的指数不一致。类似于太阳X射线耀斑，耀斑事件参数的幂律分布可以很好地解释由磁重联触发的自组织临界系统。我们的结果表明，来自核和HST-1的耀斑可能是由磁重联过程触发的。IP和Tfl在核和HST-1中的分布的一致指数表明，磁重联的能量耗散的尺寸在两个区域是相同的。这两个区域的耀斑之间的强相关性也表明耀斑的物理起源相似。
The statistical properties of X-ray flares from two separate locations (nucleus and HST-1) in the M87 jet are investigated to reveal the physical origin of the flares. We analyse the archival Chandra data for M87, and identify 14 flares in the nucleus and nine flares in HST-1. The peak intensity (IP) and the flaring duration time (Tfl) for each flare are obtained. It is found that the distributions of both IP and Tfl for the nucleus obey a power law form with a similar index. A similar result is also obtained for HST-1, and no significant inconsistency between the nucleus and HST-1 is found for the indices. Similar to solar X-ray flares, the power-law distributions of the flare event parameters can be well explained by a self-organized criticality system, which are triggered by magnetic reconnection. Our results suggest that the flares from nucleus and HST-1 are possibly triggered by magnetic reconnection process. The consistent indices for the distributions of IP and Tfl in the nucleus and HST-1 indicate that the dimensions of the energy dissipation of the magnetic reconnection are identical in the two regions. A strong correlation between the flares in the two regions also suggests a similar physical origin for the flares.