On the distribution of fluxes of gamma-ray blazars: hints for a stochastic process?
On the distribution of fluxes of gamma-ray blazars: hints for a stochastic process?
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关于伽马射线耀变体通量的分布：随机过程的暗示？
DOI：
10.1093/mnras/staa2055
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发表时间：
2020
影响因子：
4.8
通讯作者：
G. Galanti
中科院分区：
文献类型：
--
作者：
F. Tavecchio;G. Bonnoli;G. Galanti
我们研究了一个模型中观察到的时间变化的强大耀变体的$\gamma$-射线带中的动态描述的随机微分方程，包括确定性漂移和随机项的贡献。该方程的形式是由当前的天体物理学框架，接受通过提取的旋转能量的中央超大质量黑洞介导的所谓的吸积盘的磁场支持的喷气机提供动力。我们应用该模型的$\gamma$-射线光变曲线的几个明亮的耀变体，我们推断出适合于描述它们的参数。特别是，我们研究的差分分布的通量（$dN/dF_{\gamma}$），我们表明，假设的随机方程的预测概率密度函数自然再现观察到的幂律形状在大通量$dN/dF_{\gamma} \propto F_{\gamma}^{-\alpha}$与$\alpha>2$。
We examine a model for the observed temporal variability of powerful blazars in the $\gamma$-ray band in which the dynamics is described in terms of a stochastic differential equation, including the contribution of a deterministic drift and a stochastic term. The form of the equation is motivated by the current astrophysical framework, accepting that jets are powered through the extraction of the rotational energy of the central supermassive black hole mediated by magnetic fields supported by a so-called \emph{magnetically arrested} accretion disk. We apply the model to the $\gamma$-ray light curves of several bright blazars and we infer the parameters suitable to describe them. In particular, we examine the differential distribution of fluxes ($dN/dF_{\gamma}$) and we show that the predicted probability density function for the assumed stochastic equation naturally reproduces the observed power law shape at large fluxes $dN/dF_{\gamma} \propto F_{\gamma}^{-\alpha}$ with $\alpha>2$.