论文标题
从收音机到TEV光子能量的Blazar可变性功率光谱：MRK 421和PKS 2155-304
Blazar variability power spectra from radio up to TeV photon energies: Mrk 421 and PKS 2155-304
论文作者
论文摘要
我们介绍了Blazars MRK \，421和PKS \，2155 $ - $ 304的功率频谱密度（PSD）分析的结果，使用优质，在多个频率上进行密集采样的光曲线，涵盖了170年的电磁频谱和可变性时间的17年。 The data were collected from publicly available archives of observatories at radio from OVRO, optical and infrared (B, V, R, I, J, H, and K-bands), X-rays from the {\it Swift} and the {\it Rossi} X-ray Timing Explorer, high and very high energy $γ-$rays from the {\it Fermi} and Very Energetic Radiation Imaging望远镜阵列系统以及高能立体系统。我们的结果是：（1）无线电，红外和光学频率的可变性功率光谱的幂律形式具有斜率$ \ sim $ 1.8，表明随机步行类型的噪声过程； （2）在较高频率下，从X射线到非常高的能量\，$γ$ -rays的幂律形式，但是，斜率$ \ sim $ 1.2，表明闪烁的噪声类型流程； （3）与较低的能量相比，X射线时有更大的可变性功率，X射线，高能量$γ$ -100天。我们的结果不容易拟合到一个简单的模型中，在这种模型中，单个紧凑的发射区主要在我们的分析中探测的所有时间尺度上主导了大部分的辐射输出。取而代之的是，我们认为可变性功率光谱的频率依赖性形状指出了一个更复杂的图片，高度不均匀的流出产生了扩展的，分层的体积的非热发射。
We present the results of the power spectral density (PSD) analysis for the blazars Mrk\,421 and PKS\,2155$-$304, using good-quality, densely sampled light curves at multiple frequencies, covering 17 decades of the electromagnetic spectrum, and variability timescales from weeks up to a decade. The data were collected from publicly available archives of observatories at radio from OVRO, optical and infrared (B, V, R, I, J, H, and K-bands), X-rays from the {\it Swift} and the {\it Rossi} X-ray Timing Explorer, high and very high energy $γ-$rays from the {\it Fermi} and Very Energetic Radiation Imaging Telescope Array System as well as the High Energy Stereoscopic System. Our results are: (1) the power-law form of the variability power spectra at radio, infra-red and optical frequencies have slopes $\sim$1.8, indicative of random-walk type noise processes; (2) the power-law form of the variability power spectra at higher frequencies, from X-rays to very high energy \,$γ$-rays, however, have slopes $\sim$1.2, suggesting a flicker noise type process; (3) there is significantly more variability power at X-rays, high and very high energy $γ$-rays on timescales $\lesssim$ 100 days, as compared to lower energies. Our results do not easily fit into a simple model, in which a single compact emission zone is dominating the radiative output of the blazars across all the timescales probed in our analysis. Instead, we argue that the frequency-dependent shape of the variability power spectra points out a more complex picture, with highly inhomogeneous outflow producing non-thermal emission over an extended, stratified volume.
