An Old Friend: Supernova Remnant RX J1713.7–3946
September 2016 Fig. 1: Shown on the top is an optical image of the constellation Scorpius with the stars that form the constellation highlighte. The approximate position of the supernova remnant RX J1713.7-3946 is…
PKS 0736+017: a new quasar in the very-high-energy sky discovered with H.E.S.S. II
July 2016 Active Galactic Nuclei (AGNs) dominate the extragalactic sky in gamma-rays. But not all AGNs look the same. An AGN is the result of accretion of matter onto the super-massive black-hole (with a…
A Proton Accelerator? W49B Revisited
June 2016 Fig. 1: Gamma-ray excess map towards W49B obtained with H.E.S.S. The map is smoothed with a Gaussian kernel of width 0.06deg, corresponding to the 68% radius containment of the H.E.S.S. point spread…
A mysterious gamma-ray source powered by a Magnetar?
May 2016 Fig. 1: H.E.S.S. gamma-ray image of the VHE source HESS J1808-204 with 6, 5, and 4 sigma statistical significance contours (black solid lines) and intrinsic extension (white dashed circle). Green cross: best…
11 years later: Discovery of a Cosmic PeVatron in the Galactic Center
April 2016 Fig. 1: Artist’s impression of the giant molecular clouds surrounding the Galactic Centre, bombarded by very high energy protons accelerated in the vicinity of the central black hole and subsequently shining in…
Dark Matter Search In The Inner Galactic Halo: An Update With Ten Years Of Data
March 2016 Fig. 1: Projected dark matter density of a Milky Way-like galaxy from the cosmological N-body simulation Aquarius. The brightness of the image is proportional to the logarithm of the squared dark matter…
The fifth gamma-ray shell: Resolving the historic supernova remnant RCW 86/SN 185
February 2016 X-ray image of the supernova remnant shell RCW 86, left over from a giant star explosion that took place AD 185. Blue colour denotes regions which glow in non-thermal (hard) X-rays, whereas…
Ten Years Later: The Completed TeV Galactic Plane Survey
Happy New Year from the H.E.S.S. Collaboration and welcome back to the H.E.S.S. Source of the Month blog! Each month, we will feature one of the latest ground-breaking discoveries from the H.E.S.S. Collaboration. We’re…
HESS J1640−465 – an exceptionally luminous TeV gamma-ray supernova remnant
September 2013 Composite image showing radio continuum emission at 610 MHz (in blue) from the region around HESS J1640-465 / SNR G338.3−0.0, and infrared emission at 8 μm (in green) and at 24 μm…
A photon is a photon is an axion is a photon
August 2013 Illustration of gamma-ray propagation in the presence of oscillations between gamma rays and axion-like particles, in the intergalactic magnetic fields. Photon-to-axion oscillations (or vice-versa) are represented by a crooked line, while the…