The flare that sweetened the lockdown
October 2026 Everyone remembers what they did in April 2020. With the Covid-19 pandemic hitting hard, practically the entire planet was sitting at home, hoping for the best. Thanks to its remote location, H.E.S.S.…
H.E.S.S.’ most distant blazar: PKS 0346−27
February 2026 A galaxy is said to be active if its central supermassive black hole accretes matter from its environment at a high rate, forming an accretion disk. This accretion of matter onto the…
The identity crisis of the blazar PKS 1510-089
August 2023 Blazars are the most abundant sources in the VHE sky and attract a lot of attention by changing their brightness on all time scales that have been probed so far. Variability implies…
Gamma Rays from the Distant BL Lac 1ES 0347-121
October 2007 The active galaxy 1ES 0347-121 was discovered as an X-ray source in the Einstein slew survey (Elvis et al. 1992) and was later classified as a BL Lac type object (Schachter et…
PKS 2155–304 – Photons from a Hotter Hell
September 2007 “Photons from a hotter hell” is the title of T. Weekes recent commentary in Nature, concerning the recent detection of giant outbursts of active galaxies observed in high-energy gamma rays. At the…
