发表机构
University of Johannesburg; The George Washington University; National Institute for Theoretical and Computational Sciences（约翰内斯堡大学; 乔治华盛顿大学; 国家理论与计算科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究用蒙特卡洛模拟喷流γ射线在磁化AGN环境中的对级联辐射，拟合NGC 1275的SED，发现随机级联可重现宽带谱，并揭示吸积盘与BLR光子作用及磁场对级联谱的影响。
AI 中文摘要
在活动星系核（AGNi）的框架中，耀变体亚类在γ射线波段尤为明亮。这是因为它们的辐射被聚束到我们的视线方向上，而与之相对的是其未对准的母体族群——射电星系。本工作展示了一个蒙特卡洛代码的结果，该代码在磁化的AGN环境中传播喷流准直的γ射线，导致相对论性电子-正电子对产生次级级联辐射。由此产生的多波长辐射被用于拟合射电星系NGC 1275的宽带光谱能量分布（SED）。利用文献中已知的NGC 1275物理参数，我们发现来自随机过程的级联辐射有可能重现射电星系的宽带SED。我们还发现，吸积盘和宽线区（BLR）光子之间的相互作用可能为AGNi中γ射线的产生区域提供见解。虽然致密的吸积盘和BLR辐射场对级联的发展至关重要，但过高的密度会导致级联同步辐射的抑制以及TeV γ射线的衰减。此外，磁场在塑造级联γ射线谱方面起着重要作用。
英文摘要
In the scheme of active galactic nuclei (AGNi), the blazar subclass is particularly bright in $γ$-rays. This is because of their emissions being beamed into our line of sight, as opposed to their misaligned parent population, radio galaxies. This work presents results of a Monte-Carlo code that propagates jet-collimated $γ$-rays through the magnetized AGN environment, leading to secondary cascade emissions from relativistic electron-positron pairs. The resulting multi-wavelength emissions are used to fit the broadband spectral energy distribution (SED) of the radio galaxy NGC 1275. Using known physical parameters of NGC 1275 from the literature, we find that cascade emissions from stochastic processes have the potential to reproduce the broadband SEDs of radio galaxies. We also find that the interplay between accretion disk and broad-line region (BLR) photons may provide insights into the production region(s) of $γ$-rays in AGNi. While dense accretion disk and BLR radiation fields are vital to the development of cascades, excessive densities lead to the suppression of cascade synchrotron emission and attenuation of \,TeV $γ$-rays. Furthermore, the magnetic field is important in shaping the cascade $γ$-ray spectrum.
Comments11 pages, 10 figures, accepted in MNRAS
