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首页> 外文期刊>Frontiers in Astronomy and Space Sciences >Time-Evolving SED of MKN421: A Multi-Band View and Polarimetric Signatures
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Time-Evolving SED of MKN421: A Multi-Band View and Polarimetric Signatures

机译：MKN421随时间变化的SED：多波段视图和极化签名

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摘要

The most detailed temporal studies of the emission from blazars are usually done by trying to obtain a dense, simultaneous coverage of the source over a large multi-wavelenght observational campaign. Although it is well know that correlations between multi-band emission present sizeable temporal lags in their correlated variability, such properties are usually neglected in the majority of observational studies, which model the evolution of source parameters over time by either building time-averaged SEDs (when data is scarce) or considering strictly simultaneous snapshots of the source along the spectrum. By making use of the resources and large database made available through the ASI Science Data Center (ASDC), we present a novel approach to the modelling of blazar emission whereby the multi-epoch SEDs for Mkn 421 are modelled considering the temporal lags between bands (both in short and long-timescales), as obtained by a detailed cross-correlation analysis, spanning data from radio to VHE gamma-rays from 2008 to 2014. In addition to that, long-term optical polarization data is used to aid and complement our physical interpretation of the state and evolution of the source.
机译：通常通过试图在大型的多波长观测活动中获得密集，同时覆盖源的方式来进行对大黑藻发射物的最详细的时间研究。尽管众所周知，多频带发射之间的相关性在它们的相关可变性方面存在相当大的时间滞后，但是在大多数观察研究中通常忽略了这种性质，这些研究通过建立时间平均SED来模拟源参数随时间的演变（当数据稀缺时）或考虑沿光谱严格同时对源进行快照。通过利用ASI科学数据中心（ASDC）提供的资源和大型数据库，我们提出了一种对突发事件建模的新颖方法，从而针对Mkn 421的多历元SED进行了建模，同时考虑了频带之间的时间滞后（通过详细的互相关分析获得，涵盖从2008年到2014年的从无线电到VHE伽玛射线的数据。此外，长期光学偏振数据还用于辅助和补充我们对状态和源演化的物理解释。

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