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…
3C 279 – The Monster is seen again and it is devious
July 2017 Fig 1: Unified model of Active Galactic Nuclei (image credit: NASA). Almost every galaxy in the Universe harbors in its center a supermassive black hole with a mass of millions to billions…
A Deeper Look into the Supernova Remnant Vela Junior
June 2017 Fig 1: Skymap of the Vela constellation showing the Galactic plane (dashed line), the H.E.S.S. skymap of the Vela Junior region, the size of the H.E.S.S. field of view (5° in diameter…
HESS J1912+101: A new TeV supernova remnant candidate without any counterpart (yet)
May 2017 Fig 1: TeV surface brightness map of HESS J1912+101 derived with H.E.S.S. [1]. The inset on the bottom left denotes the point spread function of the TeV map. The source displays a…
Serendipitous discovery of likely alien distress call: an SOS signal from the direction of TRAPPIST-1
April 2017 Fig 1: A map showing the significance of the emission in the sky region around the quasar PKS 2303-052 (marked by the green cross). Significant gamma-ray emission at the level of 10…