AGN现象：未决问题
The AGN phenomenon: open issues
摘要：
这篇短文的目的是激励和鼓励在活动星系核（AGN）领域的研究。在这里，我们总结了有关中央引擎的主要开放问题。中央的黑洞是否在快速旋转？我们能证明这一点吗？活动星系核的主要吸积机制是什么？为什么有些活动星系核会形成喷流而有些则不会？喷流又是如何产生的？是什么使喷流在100千秒差距的距离内保持准直？耀变体的辐射是由同步加速器自康普顿过程还是由外部康普顿过程控制的？在统一模型中哪些参数是重要的？我们概述了相关研究的现状，提出了问题，并试图暗示能够解决这些基本问题的研究项目。深入调查，偏振测量，改进的模型，更快，更准确的模拟以及弥合MeV范围内的差距可以成为工具的一部分，使我们更接近AGN的理解。
英文摘要：
The aim of this short paper is to motivate and encourage research in the field of Active Galactic Nuclei (AGN). Here we summarize the main open questions concerning the central engine. Is the central black hole rapidly spinning and can we prove this? What is the dominant accretion mechanism in AGN? Why do some AGN form jets while others don't and how do the jets originate? What keeps jets collimated out to distances of 100 kpc? Is the emission of blazars dominated rather by synchrotron self-Compton or by external Compton processes? Which parameters are important in the unified model? We outline the status of related research, formulate the questions and try to hint at research projects able to tackle these fundamental topics. Deep surveys, polarization measurements, improved models, faster and more accurate simulations as well as bridging the gap in the MeV range can be part of the tools to bring us closer to an understanding of AGN.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
