Simultaneous Observations of PKS 2155-304 with HESS, Fermi, RXTE, and Atom: Spectral Energy Distributions and Variability in a Low State
We report on the first simultaneous observations that cover the optical, X-ray, and high-energy gamma-ray bands of the BL Lac object PKS 2155−304. The gamma-ray bands were observed for 11 days, between 2008 August 25…
HESS upper limit on the very high energy γ-ray emission from the globular cluster 47 Tucanae
Observations of the globular cluster 47 Tucanae (NGC 104), which contains at least 23 ms pulsars, were performed with the HESS telescope system. The observations lead to an upper limit of F(E>800 GeV) <…
Discovery of Very High Energy γ-Ray Emission from Centaurus A with H.E.S.S.
We report the discovery of faint very high energy (VHE; E > 100 GeV) γ-ray emission from the radio galaxy Centaurus A in observations performed with the High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging…
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…
