TANAMI 2 – VLBI and Multiwavelength Observations of Southern-Hemisphere AGN Jets

射电活动星系核（AGN）中超大质量黑洞附近发射的河外喷流是现代天文学和天体粒子物理学中的关键研究对象。在物质向超大质量黑洞吸积过程中释放的总引力能中，AGN喷流携带着一小部分，是超高能宇宙射线和最近探测到的高能外星中微子通量的可能来源。TANAMI是一个多波长项目，监测AGN南部天空的喷流。它结合了无线电波长的高分辨率成像和光谱监测，以及红外、光学/紫外、x射线和γ射线能量的高频观测。在TANAMI第一阶段，德国对这一国际合作方案的贡献部分由DFG提供资金。在此，我们建议支持对第一阶段结束后收集的TANAMI数据进行分析，即2013年6月至2018年12月期间的21个甚长基线干涉测量（VLBI）观测期和互补多波长观测期以及TANAMI 2项目期间的其他时期。我们将在高角分辨率下研究AGN射流的物理结构和内在特性及其与高能变异性的联系。我们将进一步研究AGN喷流中的宽带发射过程，并巩固关于AGN喷流可能是高能中微子来源的观点。

Extragalactic jets launched from the immediate vicinity of supermassive black holes in radio-loud active galactic nuclei (AGN) are key objects in modern astronomy and astroparticle physics. AGN jets carry a fraction of the total gravitational energy released during the accretion of matter onto supermassive black holes and are prime suspects as possible sources of ultrahigh-energy cosmic rays and the recently detected high-energy extraterrestrial neutrino flux. TANAMI is a multiwavelength program monitoring AGN jets of the southern sky. It combines high-resolution imaging and spectral monitoring at radio wavelengths with higher-frequency observations at IR, optical/UV, X-ray and γ-ray energies. During TANAMI phase 1, the German contribution to this international collaborative program was partially funded by DFG. Here we propose to support the analysis of TANAMI data collected after the end of phase 1, i.e., in 21 very-long-baseline interferometry (VLBI) observing epochs and complementary multiwavelength observations between Jun 2013 and Dec 2018 and in additional epochs throughout the TANAMI 2 project duration. We will study of the physical structure and intrinsic properties of AGN jets at high angular resolution and its connection to their high-energy variability. We will further study the broadband emission processes in AGN jets and consolidate the picture regarding AGN jets as possible sources of high-energy neutrinos.