Abstract

Contributed Talk - Splinter Multimessenger

Friday, 13 September 2024, 16:42   (S25)

Probing the polarized innermost structure of the relativistic jet of 4C +01.28

Luca Ricci, Eduardo Ros, Antxon Alberdi, Matthias Kadler, Guang-Yao Zhao, Joana Kramer, Sebastiano von Fellenberg, Michael Janssen, Florian Rösch, Florian Eppel
JMU Würzburg, Max Planck Institute for Radio Astronomy (Bonn), Instituto de Astrofisíca de Andalucía (Granada), Radboud University (Nijmegen), Los Alamos National Laboratory

The formation of relativistic jets from active galactic nuclei remains a subject of intense debate. Despite significant advances in understanding the underlying mechanisms, numerous questions remain. To address them, high-angular-resolution observations performed with the very long baseline interferometry (VLBI) technique are needed. In this context, we present preliminary results on 4C +01.28 (B1055+018), a blazar that shows a relevant correlation between emission at radio and gamma-ray wavelengths, and whose previous VLBI observations highlight the presence of a remarkable jet stratification. The latter consists of an inner spine with a transverse magnetic field and a distinct boundary layer - the sheath - with a longitudinal magnetic field. Exploring the properties of this unique jet stratification, alongside the jet magnetization on sub-parsec and parsec scales, is key to unlocking the secrets of the jet launching mechanisms in such a source. Thanks to the synergy between VLBI maps at various frequencies, including new 86 GHz GMVA and 230 GHz EHT observations, and relativistic MHD numerical simulations, 4C +01.28 offers an excellent opportunity for testing state-of-the-art models of jet formation.