A Cosmic Laboratory: Probing particle transport in the archetypal pulsar wind nebula HESS J1825-137
May 2018 Pulsars are fast rotating neutron stars that result from the supernova explosion of a massive star. This fast rotation induces a strong magnetic field, of 108 to 1015 times the magnetic field…
Who are you PKS 0625-354?
April 2018 The extragalactic sky seen at very high energy energies (VHE, E ≥ 100 GeV) in gamma-rays includes about 70 sources, the largest fraction of which are blazars. In the unification model of…
Discovering new Supernova remnants with H.E.S.S.
March 2018 Fig 1: Positions of the new TeV supernova remnant shell candidates (shown in the bottom panels) on the H.E.S.S. Galactic plane survey flux map (HGPS, shown at the center of the top…
A search for dark matter lines towards the inner Galactic halo
February 2018 The presence of dark matter (DM) in the universe is widely supported by a wealth of astronomical observations. One of the key observables is the Cosmic Microwave Background (CMB), produced about 380.000…
Revisiting the paradigm of hadronic acceleration in NGC 253
January 2018 Fig 1: The dusty galaxy NGC 253. Image curtesy apod.nasa.gov. The starburst in NGC 253 The Galaxy NGC 253 (shown in Fig. 1), also known as Sculptor galaxy, is located in the…
Variable TeV emission from the most luminous gamma-ray binary
December 2017 Gamma-ray binaries are binary systems comprising a massive star (typically of spectral types O or B) and a compact object. Most of the radiated power of these systems is emitted in the…
GW 170817: Follow-up observations of a neutron-star neutron-star merger
November 2017 Artist’s illustration of two merging neutron stars (Credit: NSF/LIGO/Sonoma State University/A. Simonnet) More than one hundred years have passed since Albert Einstein published his theory of general relativity, which has since proven…
The Crab Nebula is Extended
October 2017 The Crab Nebula is one of the best-studied astrophysical objects of all time and shines across the whole accessible electromagnetic spectrum, from radio wavelengths up to very high energy (VHE, E >…
Probing Local Sources with High Energy Cosmic Ray Electrons
September 2017 Cosmic rays are high energy particles that pervade the Galaxy. Electrons represent only a small fraction of cosmic rays, which consist primarily of protons and nuclei. However, they are able to provide…
Eta Carinae
August 2017 Fig 1: Excerpt of the original source material including a list of comparisons by Smyth (1843). Taken from [2]. Supernova remnants, like Vela Junior, our June Source of the Month are widely…