First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
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When surrounded by a transparent emission region, black holes are expected to reveal a
dark shadow caused by gravitational light bending and photon capture at the event horizon …

Magnetic reconnection can power bright, rapid flares originating from the inner
magnetosphere of accreting black holes. We conduct extremely high-resolution (5376× …

Simulated images of a black hole surrounded by optically thin emission typically display two
main features: a central brightness depression and a narrow" photon ring" consisting of …

The last few years have seen gamma-ray astronomy maturing and advancing in the field of
time-domain astronomy, utilizing source variability on timescales over many orders of …

Radio Galaxies have by now emerged as a new γ-ray emitting source class on the
extragalactic sky. Given their remarkable observed characteristics, such as unusual gamma …

Abstract In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing
the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and …

The M87 jet is extensively examined by utilizing general relativistic magnetohydrodynamic
(GRMHD) simulations, as well as the steady axisymmetric force-free electrodynamic (FFE) …

We present two-temperature, radiative general relativistic magnetohydrodynamic
simulations of Magnetically Arrested Discs (MAD) that launch powerful relativistic jets. The …

Active galactic nuclei in general, and the supermassive black hole in M87 in particular, show
bright and rapid gamma-ray flares up to energies of 100 GeV and above. For M87, the flares …