An extensive analysis of the sub-parsec region of 3C84

The study of jet launching in AGN is an important research method to better understand supermassive black holes (SMBHs) and their immediate surroundings. The main theoretical jet launching scenarios invoke either magnetic field lines anchored to the black hole's (BH) accretion disc (Blandford & Payne 1982) or a magnetic field, which is directly connected to its rotating ergosphere (Blandford & Znajek 1977). The nearby and bright radio galaxy 3C84 (NGC1275) is a very suitable target for testing different jet launching mechanisms, as well as for the study of the innermost, sub-parsec scale AGN structure and the jet origin. Very long baseline interferometry (VLBI) - specifically at millimetre wavelengths - offers an unparalleled view into the physical processes in action, in the close vicinity of SMBHs. Utilising such mm-VLBI observations of 3C84, we study the jet kinematics of the VLBI core region of 3C84 by employing all available, high sensitivity 3 mm-VLBI data sets of this source. As part of this analysis we associate the component ejection events with the variability light-curves at different radio frequencies and in the $\gamma$-rays. Furthermore, by cross-correlating these light-curves, we determine their time-lags and draw conclusions regarding the location of the high energy emission close to the jet base.
Comment: 9 pages, 3 figures, 15th European VLBI Network Mini-Symposium and Users' Meeting (EVN2022)