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

从射电噪声较大的活动星系核（AGN）中的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对象。活动星系核喷流携带着物质吸积到超大质量黑洞时释放的总引力能量的一小部分，是超高能宇宙射线和最近探测到的高能地外中微子流的可能来源。TANAMI是一个监测南部天空活动星系核喷流的多波长计划。它将无线电波长的高分辨率成像和光谱监测与红外、光学/紫外、X射线和γ射线能量的高频观测相结合。在TANAMI第一阶段，德国对这一国际合作计划的贡献部分由DFG资助。在这里，我们建议支持分析第1阶段结束后收集的TANAMI数据，即，在2013年6月至2018年12月之间的21个甚长基线干涉测量（VLBI）观测时期和补充多波长观测中，以及在整个TANAMI 2项目期间的其他时期。我们将在高角分辨率下研究活动星系核喷流的物理结构和内在性质，以及它们与高能变率的关系。我们将进一步研究活动星系核喷流中的宽带发射过程，巩固活动星系核喷流作为高能中微子源的可能性。

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.