Statistical Analysis on XMM-Newton X-Ray Flares of Mrk 421: Distributions of Peak Flux and Flaring Time Duration

Statistical Analysis on XMM-Newton X-Ray Flares of Mrk 421: Distributions of Peak Flux and Flaring Time Duration
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Mrk 421的XMM-牛顿X射线耀斑统计分析:峰值通量和耀斑持续时间的分布

DOI:
10.3847/1538-4357/aadd01
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发表时间:
2018-08
影响因子:
4.9
通讯作者:
Zhang Li
Zhang Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yan Dahai;Yang Shenbang;Zhang Pengfei;Dai Benzhong;Wang Jiancheng;Zhang Li

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Blazar喷流的能量耗散机理尚不清楚。耀斑可以提供对这个问题的洞察。这里我们报道了对MRK 421中X射线耀斑的XMM-牛顿观测的统计结果。我们分析了所有公开的MRK 421的XMM-牛顿X射线观测,并构建了光曲线。通过对光照曲线的拟合,得到了耀斑的峰值通量(Fp)和耀斑持续时间(TfL)等耀斑剖面参数。结果表明,Fp和TfL的分布均服从幂函数形式,具有相同的指数αF=αT≈1。这些统计性质与一维空间中具有能量耗散的自组织临界系统的预测是一致的。这与太阳耀斑相似,但能量耗散域的空间维度不同。这表明MRK 421的X射线耀斑可能是由磁重联机制驱动的。此外,在分析中我们发现,S在∼1000的时间尺度上出现了频繁的变率。这种快速变化表明发射区的磁场为G(δD是多普勒因子)。
The energy dissipation mechanism in blazar jet is unknown. Blazar flares could provide insights into this problem. Here we report statistical results of XMM-Newton observations of X-ray flares in Mrk 421. We analyze all public XMM-Newton X-ray observations for Mrk 421, and construct the light curves. Through fitting the light curves, we obtain the flare-profile parameters, such as peak flux (Fp) and flaring time duration (Tfl). It is found that the distributions of Fp and Tfl both obey a power-law form, with the same index of αF = αT ≈ 1. The statistical properties are consistent with the predictions for a self-organized criticality system with energy dissipation in one-dimensional space. This is similar to a solar flare, but with different space dimensions of the energy dissipation domain. This suggests that the X-ray flaers of Mrk 421 might be driven by a magnetic reconnection mechanism. Moreover, in the analysis, we find that variability on a timescale of ∼1000 s appears frequently. This rapid variability indicates a magnetic field of G (δD is the Doppler factor) in the emission region.
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