9 January 2023 (in person seminar)

Title: A comprehensive investigation of jet launching in the peculiar radio source 3C84

Abstract: Jets launched by AGN are essential to comprehend super-massive black holes (SMBH) and their immediate surroundings.
The main jet launching scenarios are either due to magnetic field lines anchored to the accretion disk (Blandford & Payne 1982) or directly connected to the black hole’s (BH) ergosphere (Blandford & Znajek 1977), and are an ongoing, hot topic of active research.
3C 84 (NGC 1275) is supremely suitable for testing such jet launching mechanisms, as well as studying the innermost, sub-parsec AGN structure and jet origin. Very long baseline interferometry (VLBI), and specifically at millimetre wavelengths, offers an unparalleled view into the physical processes in action, in the close vicinity of BHs. Utilising such mm-VLBI observations of 3C 84, we study the jet formation and acceleration at the VLBI core of 3C 84 by employing all available, high sensitivity mm-VLBI data sets of this source. As part of this analysis we associate the component ejection events with the multi-wavelength variability light-curves at radio frequencies and γ-rays. Furthermore, by cross-correlating these light-curves, we determine the time-lags between them and draw conclusions regarding the location of the high energy emission at the jet base. Finally, we constrain the magnetic field strength and structure.
In this talk I will present our very recent results and offer a comprehensive summary of jet launching in 3C 84.

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