Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011
About 40% of the observation time of the High Energy Stereoscopic System (H.E.S.S.) is dedicated to studying active galactic nuclei (AGN), with the aim of increasing the sample of known extragalactic very-high-energy (VHE, E>100…
HESS J1640-465 – an exceptionally luminous TeV gamma-ray SNR
The results of follow-up observations of the TeV gamma-ray source HESSJ 1640-465 from 2004 to 2011 with the High Energy Stereoscopic System (H.E.S.S.) are reported in this work. The spectrum is well described by…
Search for extended gammma-ray emission around AGN with H.E.S.S. and Fermi-LAT
Context: Very-high-energy (VHE; E>100 GeV) {\gamma}-ray emission from blazars inevitably gives rise to electron-positron pair production through the interaction of these {\gamma}-rays with the Extragalactic Background Light (EBL). Depending on the magnetic fields in…
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 both in the northern and southern hemispheres. Here we report on long-term observations of…
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…
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…