Long-term TeV and X-Ray Observations of the Gamma-Ray Binary HESS J0632+057
HESS J0632+057 is the only gamma-ray binary known so far whose position in the sky allows observations with ground-based observatories in both the northern and southern hemispheres. Here we report on long-term observations of…
Constraints on axionlike particles with H.E.S.S. from the irregularity of the PKS 2155–304 energy spectrum
Axionlike particles (ALPs) are hypothetical light (sub-eV) bosons predicted in some extensions of the Standard Model of particle physics. In astrophysical environments comprising high-energy gamma rays and turbulent magnetic fields, the existence of ALPs…
Discovery of very high energy gamma-ray emission from the BL Lac object PKS 0301-243 with H.E.S.S
The active galactic nucleus PKS 0301-243 (z=0.266) is a high-synchrotron-peaked BL Lac object that is detected at high energies (HE, 100 MeV < E < 100 GeV) by Fermi/LAT. This paper reports on the…
H.E.S.S and Fermi-LAT discovery of gamma rays from the blazar 1ES 1312-423
A deep observation campaign carried out by the High Energy Stereoscopic System (H.E.S.S.) on Centaurus A enabled the discovery of gamma rays from the blazar 1ES 1312-423, two degrees away from the radio galaxy.…
H.E.S.S. discovery of VHE gamma-rays from the quasar PKS 1510-089
The quasar PKS 1510-089 (z=0.361) was observed with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes during high states in the optical and GeV bands, to search for very high energy (VHE, defined as…
Discovery of high and very high-energy emission from the BL Lac object SHBL J001355.9-185406
The detection of the high-frequency peaked BL Lac object (HBL) SHBL J001355.9-185406 ($z$=0.095) at high (HE; 100 MeV$
Discovery of TeV gamma-ray emission from PKS 0447-439 and derivation of an upper limit on its redshift
Very high-energy gamma-ray emission from PKS 0447-439 was detected with the H.E.S.S. Cherenkov telescope array in December 2009. This blazar is one of the brightest extragalactic objects in the Fermi Bright Source List and…
Search for Very-high-energy gamma-ray emission from Galactic globular clusters with H.E.S.S
Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV
Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
Gamma-ray line signatures can be expected in the very-high-energy (VHE; E_\gamma > 100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readily distinguishable…
Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S
The extragalactic background light (EBL) is the diffuse radiation with the second highest energy density in the Universe after the cosmic microwave background. The aim of this study is the measurement of the imprint…
