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arXiv 1210.2045astro-ph.HE
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喷流中微小喷流统计模式和均方根通量关联

The minijets-in-a-jet statistical model and the RMS-flux correlation

J. Biteau, B. Giebels

摘要:

耀变体在非常高的能量下的通量变化没有明确的起源。流量在时间尺度上的变化可以精确到分钟,这表明变化起源于喷流,相对论性的增强可以缩短观测到的时间尺度,而流量与其RMS或流量分布的偏斜度之间的线性关系表明,变化源于倍增过程,在某些模型中,这与吸积盘有关。我们研究的RMS流量的关系,并强调其链接到帕累托分布,其特征在于由幂律概率密度函数。这样的分布是自然产生的一个小射流中的一个射流统计模型,其中增压发射区域是各向同性定向内的大量相对论流的射流。我们证明,在这个模型中,一个单一的微型射流的流量是成比例的RMS。当考虑大量的发射区域时,这种关系仍然成立,对于这些发射区域,总通量的分布是偏斜的,并且可以被解释为对数正态分布。喷流中的微型喷流统计模型能够很好地解释耀变体在极高能量下的快速变化和统计特性。

英文摘要:

The flux variability of blazars at very high energies does not have a clear origin. Flux variations on time scales down to the minute suggest that variability originates in the jet, where a relativistic boost can shorten the observed time scale, while the linear relation between the flux and its RMS or the skewness of the flux distribution suggests that the variability stems from multiplicative processes, which are associated in some models with the accretion disk. We study the RMS-flux relation and emphasize its link to Pareto distributions, characterized by a power-law probability density function. Such distributions are naturally generated within a minijets- in-a-jet statistical model, in which boosted emitting regions are isotropically oriented within the bulk relativistic flow of a jet. We prove that, within this model, the flux of a single minijet is proportional to its RMS. This relation still holds when considering a large number of emitting regions, for which the distribution of the total flux is skewed and could be interpreted as being log-normal. The minijets-in-a-jet statistical model reconciles the fast variations and the statistical properties of the flux of blazars at very high energies.

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