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Multi-wavelength View of M87 during the 2018 EHT Campaign Including a Gamma-ray Flaring Episode

Presentation #202.02 in the session AGN I.

Published onMay 03, 2024
Multi-wavelength View of M87 during the 2018 EHT Campaign Including a Gamma-ray Flaring Episode

In 2017, the first image of the black-hole shadow in the center of the M87 galaxy was captured by the Event Horizon Telescope (EHT). In parallel an extensive multi-wavelength (MWL) observational campaign with ground- and space-based facilities from radio all the way up to the TeV energy range was organized. M87 was found to be in a historically low state. With the second epoch of EHT observations in 2018, a similar extensive MWL campaign has been performed. Fortuitously, during our accompanying MWL campaign, the source underwent a very high energy gamma-ray flare episode, the first in over a decade, providing crucial information for investigating the origin of the gamma-ray emission in M87 radio galaxy. In this talk we present the results of the 2018 EHT-MWL campaign, as well as a comparison with the 2017 campaign and historical results.

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