The many-faced quasar PKS 1510-089
January 2020 Among all classes of Active Galactic Nuclei (AGN), the so-called BL Lac objects had been prime candidates for Very High Energy (VHE) gamma-ray emission (Note 1) from the start, as they posses…
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…
PSR B1706-44: The second pulsar detected by H.E.S.S. in the 10-100 GeV energy range
September 2019 Pulsars Over fifty years ago in 1967, a new type of signal was observed for the first time by radio astronomers [1]. The signal was periodic, remarkably regular, with a peak every…
Dark matter search towards selected dwarf satellites of the Milky Way detected by the Dark Energy Survey
August 2019 Fig. 1: Milky Way dwarf satellites detected by the Dark Energy Survey (DES) in the first two years of operation (red circles and triangles). Recently discovered dwarf galaxy candidates by Pan-STARRS and…
Core-collapse supernovae: promising candidates for PeV cosmic-ray acceleration?
July 2019 The quest of the sources of cosmic-ray (CR) particles is a hot topic in high energy astrophysics. So far, Supernova Remnants (SNRs) have been proven to be the good candidates concerning CR…
PKS1830-211: a flaring gravitationally lensed galaxy
June 2019 The Extragalactic Background Light (EBL) is the diffuse electromagnetic radiation which permeates the Universe. The largest part of the energy density of EBL is contributed by the Cosmic Microwave Background (CMB). The…
HESSJ1826-130: An extreme particle accelerator in the Galactic Plane
May 2019 Very-high-energy (VHE, E > 0.1 TeV) astronomy has rapidly progressed in the last years and currently about two hundred sources at TeV energies are known. The variety of TeV source classes is…
The Long Term Variability of the Blazar Markarian 501 – Getting to Know Your Neighbours Better!
April 2019 Fig. 1: Representation of flicker-noise (also called pink noise). The left panel shows the emission lightcurve of the coloured dot on the right panel. The flux varies according to a defined mathematical…