HESS J1534-571: A new TeV supernova remnant shell discovered with H.E.S.S.
February 2017 Fig 1: TeV surface brightness map of HESS J1534-571 derived with H.E.S.S. The green ellipse denotes the extension of the radio SNR candidate counterpart G323.7-1.0. The inset on the bottom left denotes…
H.E.S.S. observations of blazars within a new energy range
January 2017 The H.E.S.S. II array of imaging atmospheric Cherenkov telescopes. In 2012, the H.E.S.S. array initially consisting of four 12 m telescopes was upgraded to include an additional giant 28 m telescope at…
In a silent way: extreme particle acceleration in HESS J1741-302 without low-energy footprints
Spitzer 8 μm view of the sky region surrounding the dark accelerator HESS J1741-302. The white circle indicates the source region. Credit: NASA/JPL-Caltech/GLIMPSE Team, Aladin Lite. 25 years ago, when the discovery of the…
Final chapter of the 130 GeV line-like signal story
November 2016 Indirect evidence for the presence of dark matter in galaxies: rotation velocity of the stars in the galaxy NGC6503 as a function of distance to the centre (data points). To explain the…
PKS 2155-304 – a Beethoven among blazars
October 2016 PKS 2155-304 is a famous object (already 3 SoM publications, did you miss them?) in the very high energy (VHE) and extragalactic domains. This popularity is well deserved since it is one…
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…