Speaker
Description
In 2017, the Event Horizon Telescope (EHT) imaged the black-hole shadow of M87* for the first time. This achievement was paralleled by an extensive multi-wavelength (MWL) observational campaign involving ground- and space-based facilities spanning radio waves to very high-energy (VHE) gamma rays. During this initial campaign, M87's core and its innermost knot, HST-1, were observed to be in historically low states.
Continuing the success of 2017, a second run of EHT observations was conducted in 2018 accompanied by a similar extensive MWL observational campaign, during which, for the first time in over a decade, a brief VHE gamma-ray flaring episode was detected.
We present the results of the 2018 MWL observational campaign and compare them to the quiescent state observed in 2017. Broad-band spectral energy distributions, MWL light curves, and additional heuristic modeling offer insights into the origin of the gamma-ray emission from M87.
