论文标题
关于费米明亮的大麻的光谱能分布的曲率的起源和演变
On the Origin and Evolution of Curvature of the Spectral Energy Distribution of Fermi Bright Blazars
论文作者
论文摘要
频谱曲率在Blazar光谱能分布（SED）中的起源和演变尚不清楚。由于观察到的SED曲率与发射电子能量分布（EED）中的固有曲率有关，因此我们通过使用具有曲率参数和峰值能量的对数 - 羟基蛋白酶EED来研究这个问题，以使用Synchrotron和ICRVERSERVERS（IC）在Fermi-lat Bright Phime Agn样品（LBAS）中（LBAS）中所选Blazars的准单独宽带SED建模。我们发现，对数 - 促销IC模型可以成功解释样本中所有Blazars的发射。平均而言，FSRQ比BL LAC对象具有更高的磁场，多普勒因子和曲率。 BL LAC对象显示EED的曲率参数与其峰值能量之间的反相关，这是随机加速的标志。 FSRQ不会表现出这种相关性，而是在这些参数之间显示出温和的正相关关系。这表明BL LAC对象中光谱曲率的演变主要由强烈的随机加速分量组成，而FSRQ中的曲率由于额外的外部康普顿（EC）组件而在冷却统治状态下演变。 FSRQ中的强冷却不仅限制了电子峰值能量，而且还增加了发射EED的高能尾部的额外曲率。由于曲率从FSRQ降低到高峰值BL LAC对象（HBLS）与峰值相反，因此曲率参数除了峰值频率和光度外，还可以将曲率参数视为大型序列的第三个参数。
The origin and evolution of spectral curvature in blazar spectral energy distribution (SED) is still unclear. Since the observed SED curvature is related to an intrinsic curvature in emitting electron energy distribution (EED), we study this question by employing a log-parabolic EED with a curvature parameter and peak energy to model the quasi-simultaneous broadband SEDs of selected blazars in Fermi-LAT Bright AGN Sample (LBAS) using synchrotron and inverse Compton (IC) processes. We find that log-parabolic IC model can successfully explain the emission in all blazars in our sample. On average, FSRQs have higher magnetic field, Doppler factor, and curvature than BL Lac objects. The BL Lac objects show an anticorrelation between the curvature parameter of the EED and its peak energy, which is a signature of stochastic acceleration. FSRQs do not manifest such correlation and rather show a mild positive relationship between these parameters. This suggests that the evolution of spectral curvature in the BL Lac objects is dominated by a strong stochastic acceleration component, whereas the curvature in FSRQs evolves in a cooling dominated regime due to an additional external Compton (EC) component. The strong cooling in FSRQs not only restricts the electron peak energy but also adds extra curvature to the high energy tail of emitting EED. Since the curvature decreases from FSRQs toward high peak BL Lac objects (HBLs), opposite to peak energy, the curvature parameter can be considered a third parameter of the blazar sequence in addition to peak frequency and luminosity.
