The Vela Pulsar – the most Highly Energetic Clock
Source of : November 2023 Pulsars, progeny of supernova explosions, are among the most fascinating beasts in the cosmic zoo. They are rapidly rotating objects exhibiting magnetic field intensities many orders of magnitude larger…
HESS J1645−455 – A gem on the ring?
October 2023 The brightest source of gamma-ray emission in any energy band is the Milky Way. It dominates the all-sky maps obtained with scanning or hemispheric detectors operating in space (e.g. the Fermi-LAT) or…
The identity crisis of the blazar PKS 1510-089
September 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…
Cosmic Conspiracy Theories: Neutrinos and Gamma Rays from PKS 0735+178?
July 2023 Very-high-energy (VHE) gamma-rays studied with the H.E.S.S. telescopes are emitted by charged particles (mostly electrons and protons) that have been accelerated to very high energies. This ties gamma-rays to these highly relativistic…
Flares in the atmosphere
June 2023 The H.E.S.S. telescope array is used to study cosmic source that radiate very-high-energy (VHE) gamma rays, electromagnetic radiation whose photons are 1.000.000.000.000 times more energetic than the visible light that we see…
Primordial Black Holes
May 2023 By definition, Black Holes (BHs) are difficult to detect. However, many studies have now conclusively demonstrated that BHs exist – both in the mass range of a few to tens of solar…
Tracking down the mysterious gamma-ray source HESS J1809–193
March 2023 HESS J1809–193 is a gamma-ray source known since many years: it was first detected as part of the H.E.S.S. Galactic Plane Scan, and its discovery was published in 2007 [1]. Initially, it has been…
GRB 180720B The First Gamma-Ray Burst Detected in the Very-High-Energy Band
December 2019 After a decade-long search, the H.E.S.S. collaboration has succeeded to detected a gamma-ray burst in very-high-energy gamma light for the first time. This discovery was made in July 2018 using the huge…
A Gamma-ray view of Radio Galaxies
November 2019 The exploration of the universe at gamma-ray energies resulted in the discovery of ∼200 sources that emit photons of 1 Terra-Volt (1 000 000 000 000 eV) energy [1]. The largest group…
GW170817: Revisiting the site of a binary neutron star merger
October 2019 On August 17th 2017, the detection of the first electromagnetic counterpart to a gravitational-wave (GW) signal was achieved, originating from the binary neutron star (BNS) merger remnant. This result marked the start…