Revisiting the Westerlund 2 field with the HESS telescope array
Aims. Previous observations with the HESS telescope array revealed the existence of extended very-high-energy (VHE; E > 100 GeV) γ-ray emission, HESS J1023–575, coincident with the young stellar cluster Westerlund 2. At the time of discovery, the origin…
Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622
Context. The detection of gamma-rays in the very-high-energy (VHE) range (100 GeV−100 TeV) offers the possibility of studying the parent population of ultrarelativistic particles found in astrophysical sources, so it is useful for understanding the underlying astrophysical…
Discovery of VHE γ-rays from the BL Lacertae object PKS 0548-322
Aims: PKS 0548-322 (z = 0.069) is a “high-frequency-peaked” BL Lac object and a candidate very high energy (VHE, E > 100 GeV) γ-ray emitter, due to its high X-ray and radio flux. Observations…
VHE γ-ray emission of PKS 2155-304: spectral and temporal variability
Context. Observations of very high-energy γ-rays from blazars provide information about acceleration mechanisms occurring in their innermost regions. Studies of variability in these objects lead to a better understanding of the mechanisms in play.Aims.…
First detection of VHE γ-rays from SN 1006 by HESS
Aims. Recent theoretical predictions of the lowest very high energy (VHE) luminosity of SN 1006 are only a factor 5 below the previously published HESS upper limit, thus motivating further in-depth observations of this…
Multi-wavelength observations of H 2356-309
Aims: The properties of the broad-band emission from the high-frequency peaked BL Lac H 2356-309 (z = 0.165) are investigated.Methods: Very high energy (VHE; E > 100 GeV) observations of H 2356-309 were performed…
PKS 2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations
Aims: Our aim is to study the very high energy (VHE; E>100 GeV) γ-ray emission from BL Lac objects and the evolution in time of their broad-band spectral energy distribution (SED).Methods: VHE observations of…
Localizing the VHE γ-ray source at the Galactic Centre
The inner 10 pc of our Galaxy contains many counterpart candidates of the very high energy (VHE; >100 GeV) γ-ray point source HESS J1745−290. Within the point spread function of the H.E.S.S. measurement, at…
HESS upper limits on very high energy gamma-ray emission from the microquasar GRS 1915+105
Context: High energy particles reside in the relativistic jets of microquasars, making them possible sources of very high energy radiation (VHE, >100 GeV). Detecting this emission would provide a new handle on jet physics.Aims:…
Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S.
The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by the ATIC experiment has – together with the PAMELA detection of a rise in the positron fraction up…
