Discovery of very high energy γ-ray emission from the BL Lacertae 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 discovery of PKS 0301−243 at very…
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…
HESS and Fermi-LAT discovery of γ-rays from the blazar 1ES 1312−423
A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of γ-rays from the blazar 1ES 1312−423, 2° away from the radio galaxy. With a differential…
H.E.S.S. discovery of VHE γ-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 E ≥ 0.1 TeV)…
Discovery of high and very high-energy emission from the BL Lacertae 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 < E < 300 GeV) and very high-energy (VHE; E > 100 GeV) with the Fermi Large Area Telescope (LAT) and the…
Discovery of TeV γ-ray emission from PKS 0447–439 and derivation of an upper limit on its redshift
Very high-energy γ-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 has…
H.E.S.S. observations of the binary system PSR B1259-63/LS 2883 around the 2010/2011 periastron passage
Aims. We present very high energy (VHE; E > 100 GeV) data from the γ-ray binary system PSR B1259-63/LS 2883 taken around its periastron passage on 15th of December 2010 with the High Energy Stereoscopic System…
Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
Context. Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV < E < 100 GeV) γ-ray radiation which could originate from the cumulative emission of the numerous millisecond pulsars (msPSRs) in the clusters’ cores or from inverse…
Search for Photon-Linelike Signatures from Dark Matter Annihilations with H.E.S.S.
Gamma-ray line signatures can be expected in the very-high-energy (𝐸𝛾 >100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readily distinguishable from astrophysical 𝛾-ray…
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…
