Upper limits from HESS active galactic nuclei observations in 2005–2007
Aims: Very high energy (VHE; E>100 GeV) γ-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. Methods: VHE observations of a sample of 14 AGN, considered candidate…
HESS observations and VLT spectroscopy of PG 1553+113
Aims: The properties of the very high energy (VHE; E > 100 GeV) γ-ray emission from the high-frequency peaked BL Lac PG 1553+113 are investigated. An attempt is made to measure the currently unknown…
HESS very-high-energy gamma-ray sources without identified counterparts
Context: The detection of gamma rays in the very-high-energy (VHE) energy range (100 GeV-100 TeV) provides a direct view of the parent population of ultra-relativistic particles found in astrophysical sources. For this reason, VHE…
New constraints on the mid-IR EBL from the HESS discovery of VHE γ-rays from 1ES 0229+200
Aims: To investigate the very high energy (VHE: >100 GeV) γ-ray emission from the high-frequency peaked BL Lac 1ES 0229+200. Methods: Observations of 1ES 0229+200 at energies above 580 GeV were performed with the…
Discovery of VHE γ-rays from the distant BL Lacertae 1ES 0347-121
Aims: Our aim is to study the production mechanism for very-high-energy (VHE; >100 GeV) γ-rays in distant active galactic nuclei (AGN) and use the observed VHE spectrum to derive limits on the Extragalactic Background…
An Exceptional Very High Energy Gamma-Ray Flare of PKS 2155–304
The high-frequency peaked BL Lac PKS 2155-304 at redshift z = 0.116 is a well-known VHE (>100 GeV) γ-ray emitter. Since 2002 its VHE flux has been monitored using the H.E.S.S. stereoscopic array of…
Search for pulsed VHE gamma-ray emission from young pulsars with HESS
Aims.We present the results of a search for pulsed very-high-energy (VHE) γ-ray emission from young pulsars using data taken with the HESS imaging atmospheric Cherenkov telescope system. Methods.Data on eleven pulsars, selected according to their…
H.E.S.S. Observations of the Supernova Remnant RX J0852.0–4622: Shell-Type Morphology and Spectrum of a Widely Extended Very High Energy Gamma-Ray Source
The shell-type supernova remnant RX J0852.0-4622 was observed with the High Energy Stereoscopic System (H.E.S.S.) of atmospheric Cerenkov telescopes between 2004 December and 2005 May for a total observation time of 33 hr, above…
Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with HESS and broadband characterisation
Context: The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System (HESS) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a live time of 43 h. VHE (E > 1011…
Discovery of two candidate pulsar wind nebulae in very-high-energy gamma rays
Context: We present the discovery of two very-high-energy γ-ray sources in an ongoing systematic search for emission above 100 GeV from pulsar wind nebulae in survey data from the HESS telescope array. Aims: Imaging…
