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…
The H.E.S.S. I legacy extragalactic survey
March 2019 From the beginning of the H.E.S.S. I four telescope observations, until the upgrade with the addition of the 28m diameter telescope marking H.E.S.S. phase II (January 2013), H.E.S.S continuously observed both the…
First observation of a UAV with IACTs
February 2019 In a never-ending quest to better understand the Universe around us, astronomers are constantly in pursuit of new technologies and techniques that make their observations more accurate and their telescopes more sensitive.…
3C279 – the monster in Virgo is back!
January 2019 [1] The relativistic Doppler effect tells us that a receding object will appear redder, while an approaching one will appear bluer and the higher the relative velocity, the stronger the effect. Because…
Searching for very-high-energy cosmic-ray electron sources
December 2018 Most TeV cosmic rays are believed to be produced in the Galaxy. In contrast to hadronic cosmic rays, cosmic ray electrons (CRE) propagating in the interstellar medium quickly lose their energy though…
First ground-based measurement of sub-20 GeV to 100 GeV gamma-ray pulsations from the Vela pulsar
November 2018 Pulsars are fast rotating (up to ~1000 rotations per second) and strongly magnetised (magnetic field intensities are trillion times that of the Earth) neutron stars.These compact objects (~1.4 solar masses, but a…