论文标题

Blazars $γ$ ray变异性的确定性方面

Deterministic Aspect of the $γ$-ray Variability in Blazars

论文作者

Bhatta, Gopal, Pánis, Radim, Stuchlík, Zdeněk

论文摘要

线性时间序列分析(主要是基于傅立叶变换的方法)在提取活性银河核的持续调节光曲线(LC)中的信息方面非常成功,从而有助于表征超质量黑洞系统的一般特征。特别是,发现$γ$ ray的统计属性被发现在时间频域中闪烁噪声表现得很合理。但是,这些常规方法无法完全封装来源光曲线中显示的丰富度和复杂性。在这项工作中,为了补充我们先前关于类似主题的研究,我们对20年的费米/LAT观测值进行了非线性时间序列分析,该分析为20 $γ$ - ray Bright Blight Blazars。这项研究的促进是解决最相关的查询之一,即导致观察到的$γ$ - 射线变异性的主要动力学过程是确定性或随机性质的。出于此目的,我们对Blazars进行复发量化分析,并直接测量数量,这表明Blazar中的动力学过程可能是确定性和随机过程的组合,而某些源光曲线揭示了明显的确定性含量。在构建可以解释活性银河系核中丰富而复杂的多波长观测特征的模型中,在构建模型中可能有明显有用的结果可能与大盘中强烈的磁盘连接的可能含义可能具有显着有用的结果。此外,我们估计了动态时间尺度,即几周的时间,即所谓的“捕获时间尺度”。

Linear time series analysis, mainly the Fourier transform based methods, has been quite successful in extracting information contained in the ever-modulating light curves (Lcs) of active galactic nuclei, and thereby contribute in characterizing the general features of supermassive black hole systems. In particular, the statistical properties of $γ$-ray variability of blazars are found to be fairly represented by flicker noise in the temporal frequency domain. However, these conventional methods have not been able to fully encapsulate the richness and the complexity displayed in the light curves of the sources. In this work, to complement our previous study on the similar topic, we perform non-linear time series analysis of the decade-long Fermi/LAT observations of 20 $γ$-ray bright blazars. The study is motivated to address one of the most relevant queries that whether the dominant dynamical processes leading to the observed $γ$-ray variability are of deterministic or stochastic nature. For the purpose, we perform Recurrence Quantification Analysis of the blazars and directly measure the quantities which suggest that the dynamical processes in blazar could be a combination of deterministic and stochastic processes, while some of the source light curves revealed significant deterministic content. The result with possible implication of strong disk-jet connection in blazars could prove to be significantly useful in constructing models that can explain the rich and complex multi-wavelength observational features in active galactic nuclei. In addition, we estimate the dynamical timescales, so called "trapping timescales", in the order of a few weeks.

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