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.
Cite
@article{arxiv.2504.21221,
title = {The H.E.S.S. extragalactic sky survey with the first decade of observations},
author = {H. E. S. S. Collaboration and F. Aharonian and F. Ait Benkhali and J. Aschersleben and H. Ashkar and M. Backes and V. Barbosa Martins and R. Batzofin and Y. Becherini and D. Berge and K. Bernlöhr and M. Böttcher and C. Boisson and J. Bolmont and M. de Bony de Lavergne and J. Borowska and M. Bouyahiaoui and F. Bradascio and R. Brose and A. Brown and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and T. Bylund and S. Casanova and J. Celic and M. Cerruti and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and G. Cotter and P. Cristofari and J. Damascene Mbarubucyeye and I. D. Davids and J. Devin and J. Djuvsland and A. Dmytriiev and K. Egberts and S. Einecke and S. Fegan and G. Fontaine and S. Funk and S. Gabici and J. F. Glicenstein and J. Glombitza and P. Goswami and G. Grolleron and L. Haerer and B. Heß and J. A. Hinton and W. Hofmann and T. L. Holch and M. Holler and D. Horns and Zhiqiu Huang and M. Jamrozy and F. Jankowsky and A. Jardin-Blicq and E. Kasai and K. Katarzyński and R. Khatoon and B. Khélifi and Nu. Komin and K. Kosack and D. Kostunin and A. Kundu and R. G. Lang and S. Le Stum and A. Lemière and M. Lemoine-Goumard and J. -P. Lenain and F. Leuschner and A. Luashvili and J. Mackey and D. Malyshev and V. Marandon and G. Martí-Devesa and R. Marx and A. Mehta and A. Mitchell and R. Moderski and L. Mohrmann and A. Montanari and M. de Naurois and J. Niemiec and P. O'Brien and L. Olivera-Nieto and E. de Ona Wilhelmi and M. Ostrowski and S. Panny and M. Panter and U. Pensec and G. Pühlhofer and M. Punch and A. Quirrenbach and S. Ravikularaman and M. Regeard and A. Reimer and O. Reimer and I. Reis and H. Ren and B. Reville and F. Rieger and G. Rowell and B. Rudak and E. Ruiz-Velasco and V. Sahakian and H. Salzmann and D. A. Sanchez and A. Santangelo and M. Sasaki and J. Schäfer and F. Schüssler and J. N. S. Shapopi and A. Sharma and H. Sol and S. Spencer and Ł. Stawarz and R. Steenkamp and S. Steinmassl and C. Steppa and H. Suzuki and T. Takahashi and T. Tanaka and A. M. Taylor and R. Terrier and A. Thakur and M. Tsirou and C. van Eldik and M. Vecchi and C. Venter and J. Vink and H. J. Völk and T. Wach and S. J. Wagner and A. Wierzcholska and M. Zacharias and A. A. Zdziarski and A. Zech and N. Żywucka},
journal= {arXiv preprint arXiv:2504.21221},
year = {2025}
}
Comments
23 pages, 13 figures. Published in A&A