The H.E.S.S. extragalactic sky survey with the first decade of observations

Abstract

The results of the first extragalactic gamma-ray survey by the High Energy Stereoscopic System (H.E.S.S.) are presented. The survey comprises 2720 hours of very high-energy gamma-ray observations of the extragalactic sky, recorded with H.E.S.S. from 2004 up to the end of 2012. These data have been re-analysed using a common consistent set of up-to-date data calibration and analysis tools. From this analysis, a list of 23 detected objects, predominantly blazars, was obtained. This catalogue was assessed in terms of the source class populations that it contains. The level of source parameter bias for the blazar sources, probed by this observational dataset, was evaluated using Monte-Carlo simulations. Spectral results obtained with the H.E.S.S. data were compared with the \textit{Fermi}-LAT catalogues to present the full gamma-ray picture of the detected objects. Lastly, this unique dataset was used to assess the contribution of BL Lacertae objects and flat-spectrum radio quasars to the extragalactic gamma-ray background light at several hundreds of giga-electronvolts. These results are accompanied by the release of the high-level data to the astrophysical community.

23 pages, 13 figures. Published in A&A

References in corpus (40)

• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• Observations of the Crab Nebula with H.E.S.S
• Evidence for neutrino emission from the nearby active galaxy NGC 1068
• Background Modelling in Very-High-Energy gamma-ray Astronomy
• The 5th edition of the Roma-BZCAT. A short presentation
• Fast variability of TeV gamma-rays from the radio galaxy M 87
• A very-high-energy component deep in the Gamma-ray Burst afterglow
• New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
• Detection of Gamma Rays From a Starburst Galaxy
• The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
• The Origin of the Extragalactic Gamma-Ray Background and Implications for Dark-Matter Annihilation
• Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow
• First detection of VHE gamma-rays from SN 1006 by H.E.S.S
• Search for Lorentz Invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944
• Discovery of VHE gamma-rays from the distant BL Lac 1ES 0347-121
• Search for dark matter annihilation signals in the H.E.S.S. Inner Galaxy Survey
• Evidence for VHE Gamma-ray Emission from the Distant BL Lac PG 1553+113
• Measurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of H.E.S.S. blazars
• A search for HI absorption in nearby radio galaxies using HIPASS
• Discovery of Very High Energy Gamma-Ray Emission from the BL Lac Object H2356-309 with the H.E.S.S. Cherenkov Telescopes
• The 2014 TeV Gamma-ray Flare of Mrk 501 Seen with H.E.S.S.: Temporal and Spectral Constraints on Lorentz Invariance Violation
• Discovery of VHE gamma-rays from the high-frequency-peaked BL Lac object RGB J0152+017
• Resolving acceleration to very high energies along the Jet of Centaurus A
• H.E.S.S. observations of gamma-ray bursts in 2003-2007
• The TeV Diffuse Cosmic Neutrino Spectrum and the Nature of Astrophysical Neutrino Sources
• Constraints on the intergalactic magnetic field using Fermi-LAT and H.E.S.S. blazar observations
• Characterizing the gamma-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT
• The high-energy $\gamma$-ray emission of AP Librae
• Observation of a sudden cessation of a very-high-energy gamma-ray flare in PKS 1510-089 with H.E.S.S. and MAGIC in May 2016
• Optical spectroscopy of Blazars for the Cherenkov Telescope Array
• Unveiling the origin of the gamma-ray emission in NGC 1068 with the Cherenkov Telescope Array
• Very high energy $\gamma$-ray emission from two blazars of unknown redshift and upper limits on their distance
• The vanishing of the primary emission region in PKS 1510-089
• Search for dark matter annihilation in the dwarf irregular galaxy WLM with H.E.S.S
• First bounds on the very high energy gamma-ray emission from Arp 220
• Curvature in the very-high energy gamma-ray spectrum of M87
• Constraints on the extragalactic magnetic field strength from blazar spectra based on 145 months of Fermi-LAT observations
• Constraining the cosmic-ray pressure in the inner Virgo Cluster using H.E.S.S. observations of M 87
• Analysis methods to search for transient events in ground-based Very High Energy gamma-ray astronomy
• The Making of Catalogues of Very-High-Energy γ-ray Sources