Discovery of Gamma-Ray Emission From the Shell-Type Supernova Remnant RCW 86 With HESS
The shell-type supernova remnant (SNR) RCW 86, possibly associated with the historical supernova SN 185, with its relatively large size (about 40′ in diameter) and the presence of nonthermal X-rays is a promising target…
HESS observations of γ-ray bursts in 2003-2007
Aims: Very-high-energy (VHE; ⪆100 GeV) γ-rays are expected from γ-ray bursts (GRBs) in some scenarios. Exploring this photon energy regime is necessary for understanding the energetics and properties of GRBs. Methods: GRBs have been…
A Search for a Dark Matter Annihilation Signal Toward the Canis Major Overdensity with H.E.S.S.
A search for a dark matter (DM) annihilation signal into γ-rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario represents it…
Energy Spectrum of Cosmic-Ray Electrons at TeV Energies
The very large collection area of ground-based 𝛾-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy ( >600 GeV) cosmic-ray electrons. Here we present the electron…
Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with HESS
Aims. The nearby galaxy clusters Abell 496 and Abell 85 are studied in the very high-energy (VHE, E> 100 GeV) band to investigate VHE cosmic rays (CRs) in this class of objects which are the largest…
HESS Observations of the Prompt and Afterglow Phases of GRB 060602B
We report on the first completely simultaneous observation of a gamma-ray burst (GRB) using an array of Imaging Atmospheric Cherenkov Telescopes, which is sensitive to photons in the very high energy (VHE) γ-ray range…
Simultaneous HESS and Chandra observations of Sagittarius A* during an X-ray flare
The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A* implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV γ-ray source HESS J1745-290 is…
Search for gamma rays from dark matter annihilations around intermediate mass black holes with the HESS experiment
The HESS array of Cherenkov telescopes has performed, from 2004 to 2007, a survey of the inner galactic plane at photon energies above 100 GeV. About 400 hours of data have been accumulated in the region…
Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304
In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can…
Discovery of a VHE gamma-ray source coincident with the supernova remnant CTB 37A
Aims: The supernova remnant (SNR) complex CTB 37 is an interesting candidate for observations with very high energy (VHE) γ-ray telescopes such as HESS. In this region, three SNRs are seen. One of them…
