A multiwavelength view of the flaring state of PKS 2155-304 in 2006
Context. Multiwavelength (MWL) observations of the blazar PKS 2155-304 during two weeks in July and August 2006, the period when two exceptional flares at very high energies (VHE, E ≳ 100 GeV) occurred, provide a detailed picture of…
Discovery of hard-spectrum γ-ray emission from the BL Lacertae object 1ES 0414+009
Context. 1ES 0414 + 009 (z = 0.287) is a distant high-frequency-peaked BL Lac object, and has long been considered a likely emitter of very-high-energy (VHE, E > 100 GeV) γ-rays due to its high X-ray and radio flux. Aims. Observations in…
The 2010 Very High Energy γ-Ray Flare and 10 Years of Multi-wavelength Observations of M 87
The giant radio galaxy M 87 with its proximity (16 Mpc), famous jet, and very massive black hole ((3 − 6) × 109 M☉) provides a unique opportunity to investigate the origin of very high energy (VHE;…
Discovery of extended VHE γ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
Aims. Results obtained in very-high-energy (VHE; E ≥ 100 GeV) γ-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in the vicinity of the young massive stellar cluster Westerlund 1 (Wd 1). Methods.…
Discovery of the source HESS J1356-645 associated with the young and energetic PSR J1357-6429
Context. Several newly discovered very-high-energy (VHE; E > 100 GeV) γ-ray sources in the Galaxy are thought to be associated with energetic pulsars. Among them, middle-aged (≳ 104 yr) systems exhibit large centre-filled VHE nebulae, offset from the pulsar position,…
Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state
The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV γ-ray (H.E.S.S.), GeV γ-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and optical (ATOM, Swift)…
Very-high-energy gamma-ray emission from the direction of the Galactic globular cluster Terzan 5
The HESS very-high-energy (VHE, E > 0.1 TeV) gamma-ray telescope system has discovered a new source, HESS J1747-248. The measured integral flux is (1.2 ± 0.3) × 10-12 cm-2 s-1 above 440 GeV for a power-law photon spectral index of 2.5 ± 0.3stat ± 0.2sys. The VHE gamma-ray source…
A new SNR with TeV shell-type morphology: HESS J1731-347
Aims. The recent discovery of the radio shell-type supernova remnant (SNR), G353.6-0.7, in spatial coincidence with the unidentified TeV source HESS J1731−347 has motivated further observations of the source with the High Energy Stereoscopic…
H.E.S.S. Observations of the Globular Clusters NGC 6388 and M15 and Search for a Dark Matter Signal
Observations of the globular clusters (GCs) NGC 6388 and M15 were carried out by the High Energy Stereoscopic System array of Cherenkov telescopes for a live time of 27.2 and 15.2 hr, respectively. No…
Search for a Dark Matter Annihilation Signal from the Galactic Center Halo with H.E.S.S.
A search for a very-high-energy (VHE; ≥100 GeV) 𝛾-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance 𝑟 ∼45–150 pc from the Galactic center. The background-subtracted 𝛾-ray spectrum measured…
