Shocks, polarisation, and high-energy emission: Probing black hole jets from VLBI to IXPE

Abstract:

Relativistic jets launched by accreting supermassive black holes are fundamental drivers of feedback in galaxies, yet the location and mechanisms responsible for high- energy γ-ray emission remain uncertain. I will present recent multimessenger studies combining VLBI imaging, IXPE X-ray and optical polarimetry, γ-ray monitoring, and neutrino observations of blazars undergoing major flaring events. These coordinated campaigns reveal shock–shock interactions in the parsec-scale jet, conditions favourable for hadronic emission, and γ-ray production occurring well downstream of the central engine. I will discuss these results in the context of our broader efforts with the Event Horizon Telescope to directly probe the physical conditions governing jet formation and high-energy radiation near supermassive black holes. Finally, I will touch upon the collaborative work planned with colleagues at the ATNF.

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