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Multi-wavelength Overview of the EHT Non-horizon AGN Targets

Presentation #307.05 in the session The Event Horizon Telescope in Light of High-Energy Emission.

Published onJul 01, 2023
Multi-wavelength Overview of the EHT Non-horizon AGN Targets

Black holes are among the most spectacular objects in the universe. In 2017, the Event Horizon Telescope (EHT) allowed us to observe the first black hole shadow images at the center of M87 and our Milky Way galaxy, Sgr A*, demonstrating that it is now possible to directly study the closest vicinity of supermassive black holes (SMBHs) via electromagnetic radiation. Furthermore, the tremendous gravitational pull of a SMBH can power relativistic jets of particles that travel across vast distances. These objects produce electromagnetic radiation spanning from radio waves up to gamma rays and are associated with a number of questions about their launch from the central engine and more that remain open until today. Hence, to get the most out of the fine structure that EHT resolution can reveal, we have achieved quasi-simultaneous multi-wavelength observations of the same targets. Other objects observed by EHT since 2017 include 3C 454.3, 3C 279, 3C 273, OJ 287, Cen A, NGC 1052, NRAO 530, and J1924-2914, in addition to M87 and Sgr A*. In this talk, we intend to present the substantive multi-wavelength campaigns carried out by the EHT Multi-Wavelength Science Working Group (MWL WG) and Active Galactic Nuclei Working Group (AGN WG), including EHT collaboration members and partner facilities, which help us to test the newest generation of black-hole shadow emission and jet formation theoretical models, as well as investigate the origin of the high-energy emission and jet morphology over a wide range of physical scales.

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