H.E.S.S. Collaboration

Hidden by the Shell – A Pulsar Wind Nebula Emerges in Vela Junior

H.E.S.S. Collaboration — Sun, 01 Mar 2026 12:00:00 +0000

March 2026 A pulsar is a highly magnetised, rapidly-rotating neutron star resulting from the collapse of the progenitor star’s compact core during a supernova explosion. This strong magnetic field then induces an electric field…

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H.E.S.S.’ most distant blazar: PKS 0346−27

H.E.S.S. Collaboration — Sun, 01 Feb 2026 00:00:00 +0000

February 2026 A galaxy is said to be active if its central supermassive black hole accretes matter from its environment at a high rate, forming an accretion disk. This accretion of matter onto the…

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Too Young to Be This Large: The Puzzling Case of HESS J1813–178

H.E.S.S. Collaboration — Thu, 01 Jan 2026 00:00:00 +0000

January 2026 Earth is constantly bombarded by highly energetic particles from space, known as cosmic rays. Since their discovery, the question of their origin and acceleration mechanism has been one of the central questions…

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V4641 Sagittarii – the not-so-unremarkable microquasar

H.E.S.S. Collaboration — Mon, 01 Dec 2025 13:55:48 +0000

December 2025 For decades, we have sought to understand the origin of the most energetic particles in the Universe: cosmic rays. The energy range of cosmic rays arriving to Earth span more than ten…

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The Vela Pulsar – the most Highly Energetic Clock

H.E.S.S. Collaboration — Wed, 01 Nov 2023 12:00:00 +0000

November 2023 Pulsars, progeny of supernova explosions, are among the most fascinating beasts in the cosmic zoo. They are rapidly rotating objects exhibiting magnetic field intensities many orders of magnitude larger than what we…

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HESS J1645−455 – A gem on the ring?

H.E.S.S. Collaboration — Sun, 01 Oct 2023 12:00:00 +0000

October 2023 The brightest source of gamma-ray emission in any energy band is the Milky Way. It dominates the all-sky maps obtained with scanning or hemispheric detectors operating in space (e.g. the Fermi-LAT) or…

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The identity crisis of the blazar PKS 1510-089

H.E.S.S. Collaboration — Tue, 01 Aug 2023 12:00:00 +0000

August 2023 Blazars are the most abundant sources in the VHE sky and attract a lot of attention by changing their brightness on all time scales that have been probed so far. Variability implies…

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Cosmic Conspiracy Theories: Neutrinos and Gamma Rays from PKS 0735+178?

H.E.S.S. Collaboration — Sat, 01 Jul 2023 14:29:00 +0000

July 2023 Very-high-energy (VHE) gamma-rays studied with the H.E.S.S. telescopes are emitted by charged particles (mostly electrons and protons) that have been accelerated to very high energies. This ties gamma-rays to these highly relativistic…

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Flares in the atmosphere

H.E.S.S. Collaboration — Thu, 01 Jun 2023 12:00:00 +0000

June 2023 The H.E.S.S. telescope array is used to study cosmic source that radiate very-high-energy (VHE) gamma rays, electromagnetic radiation whose photons are 1.000.000.000.000 times more energetic than the visible light that we see…

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Primordial Black Holes

H.E.S.S. Collaboration — Mon, 01 May 2023 09:00:00 +0000

May 2023 By definition, Black Holes (BHs) are difficult to detect. However, many studies have now conclusively demonstrated that BHs exist – both in the mass range of a few to tens of solar…

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