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Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011

A. Abramowski F. Aharonian F. Ait Benkhali A. G. Akhperjanian E. Angüner G. Anton S. Balenderan Agnès Balzer A. Barnacka Y. Becherini J. Becker Tjus K. Bernlöhr E. Birsin E. Bissaldi J. Biteau 1 M. Böttcher C. Boisson 2 J. Bolmont 3 P. Bordas J. Brucker F. Brun P. Brun 4 T. Bulik S. Carrigan S. Casanova M. Cerruti 2 P. M. Chadwick R. Chalme-Calvet 3 R. C. G. Chaves A. Cheesebrough M. Chrétien 3 S. Colafrancesco G. Cologna J. Conrad C. Couturier 3 Y. Cui M. Dalton 5 M. K. Daniel I. D. Davids B. Degrange 1 C. Deil P. Dewilt H. J. Dickinson A. Djannati-Ataï 6 W. Domainko L. O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda T. Edwards K. Egberts P. Eger P. Espigat 6 C. Farnier S. Fegan 1 F. Feinstein 7 M. V. Fernandes D. Fernandez 7 A. Fiasson 8 G. Fontaine 1 A. Förster M. Füßling M. Gajdus Y. A. Gallant 7 T. Garrigoux 3 G. Giavitto B. Giebels 1 J. F. Glicenstein M.-H. Grondin M. Grudzińska S. Häffner J. Hahn J. Harris G. Heinzelmann G. Henri G. Hermann O. Hervet 2 A. Hillert J. A. Hinton W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska 3 C. Jahn M. Jamrozy M. Janiak F. Jankowsky I. Jung M. A. Kastendieck K. Katarzyński U. Katz S. Kaufmann B. Khélifi 6 Michel Kieffer 3 S. Klepser D. Klochkov W. Kluźniak T. Kneiske D. Kolitzus Nu. Komin 8 K. Kosack S. Krakau F. Krayzel 8 P. P. Krüger H. Laffon 5 G. Lamanna 8 J. Lefaucheur 6 A. Lemière 6 M. Lemoine-Goumard 9 J.-P. Lenain 3 D. Lennarz T. Lohse A. Lopatin C.-C. Lu V. Marandon Alexandre Marcowith 7 R. Marx G. Maurin 8 N. Maxted M. Mayer T. J. L. Mccomb J. Méhault 5 P. J. Meintjes U. Menzler M. Meyer R. Moderski M. Mohamed Emmanuel Moulin T. Murach C. L. Naumann 3 M. de Naurois 1 J. Niemiec S. J. Nolan L. Oakes S. Ohm E. de Oña Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter R. D. Parsons M. Paz Arribas N. W. Pekeur G. Pelletier J. Perez P.-O. Petrucci B. Peyaud S. Pita 6 H. Poon G. Pühlhofer M. Punch 6 A. Quirrenbach S. Raab M. Raue A. Reimer O. Reimer Matthieu Renaud 7 R. de los Reyes F. Rieger L. Rob C. Romoli S. Rosier-Lees 8 G. Rowell B. Rudak C. B. Rulten 2 V. Sahakian D. A. Sanchez 8 A. Santangelo R. Schlickeiser F. Schüssler A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer H. Sol 2 G. Spengler F. Spies Ł. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J.-P. Tavernet 3 T. Tavernier 6 A. M. Taylor R. Terrier 6 M. Tluczykont C. Trichard 8 K. Valerius C. van Eldik B. van Soelen George Vasileiadis 7 C. Venter A. Viana P. Vincent 3 H. J. Völk F. Volpe M. Vorster T. Vuillaume S. J. Wagner P. Wagner M. Ward M. Weidinger Q. Weitzel R. White A. Wierzcholska P. Willmann A. Wörnlein D. Wouters V. Zabalza M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech 2 H.-S. Zechlin
1 LLR - Laboratoire Leprince-Ringuet
2 LUTH (UMR_8102) - Laboratoire Univers et Théories
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
5 ASTRO - Astroparticules
CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
6 APC (UMR_7164) - AstroParticule et Cosmologie
7 LUPM - Laboratoire Univers et Particules de Montpellier
8 LAPP - Laboratoire d'Annecy de Physique des Particules
9 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
Abstract : 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 GeV) sources and constraining the physical processes at play in potential emitters. H.E.S.S. observations of AGN, spanning a period from April 2004 to December 2011, are investigated to constrain their gamma-ray fluxes. Only the 47 sources without significant excess detected at the position of the targets are presented. Upper limits on VHE fluxes of the targets were computed and a search for variability was performed on the nightly time scale. For 41 objects, the flux upper limits we derived are the most constraining reported to date. These constraints at VHE are compared with the flux level expected from extrapolations of Fermi-LAT measurements in the two-year catalog of AGN. The H.E.S.S. upper limits are at least a factor of two lower than the extrapolated Fermi-LAT fluxes for 11 objects. Taking into account the attenuation by the extragalactic background light reduces the tension for all but two of them, suggesting intrinsic curvature in the high-energy spectra of these two AGN. Compilation efforts led by current VHE instruments are of critical importance for target-selection strategies before the advent of the Cherenkov Telescope Array, CTA.
Keywords : Cosmology and Extragalactic Astrophysics Galaxy Astrophysics Astrophysics High Energy Astrophysical Phenomena
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Journal articles
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Submitted on : Monday, February 17, 2014 - 3:04:34 PM
Last modification on : Monday, December 13, 2021 - 9:15:45 AM

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IN2P3 | OBSPM | UNIV-SAVOIE | CENBG | LAPP | LLR | UPMC | CNRS | X | X-LLR | LUPM | CEA | DSM-IRFU | IRFU-APC | MIPS | UNIV-MONTPELLIER | CEA-DRF | X-DEP-PHYS | SORBONNE-UNIVERSITE | UNIV-PARIS7 | LUPM_EMA | UNIV-PARIS | UP-SCIENCES | LUTH | INSU | PSL | UGA | SU-TI | APC | LPNHE | SU-SCIENCES

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A. Abramowski, F. Aharonian, F. Ait Benkhali, A. G. Akhperjanian, E. Angüner, et al.. Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 564, pp.A9. ⟨10.1051/0004-6361/201322897⟩. ⟨in2p3-00947917⟩

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