Upper limits from HESS active galactic nuclei observations in 2005–2007

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ID: 267552
2007
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Abstract
Aims.Very high energy (VHE; GeV) γ-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes.Methods.VHE observations of a sample of 14 AGN, considered candidate VHE emitters, were made with the High Energy Stereoscopic System (HESS) between January 2005 and July 2007. Large-zenith-angle observations of three northern AGN (Mkn 421, Mkn 501, 1ES 1218+304), known to emit VHE γ-rays, were also performed in order to sample their spectral energy distributions (SEDs) above 1 TeV. In addition, the VHE flux from 1ES 1101-232, previously detected by HESS in 2004-2005, was monitored during 2006 and 2007.Results.As significant detections from the HESS observation program are reported elsewhere, the results reported here are primarily integral flux upper limits. The average exposure for each of the 14 VHE-candidate AGN is ~7 h live time, and the observations have an average energy threshold between 230 GeV and 590 GeV. Upper limits for these 14 AGN range from
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Authors F. Aharonian,A. G. Akhperjanian,U. Barres De Almeida,A. R. Bazer-Bachi,B. Behera,M. Beilicke,W. Benbow,K. Bernlöhr,C. Boisson,O. Bolz,V. Borrel,I. Braun,E. Brion,A. M. Brown,R. Bühler,Tomasz Bulik,I. Büsching,T. Boutelier,S. Carrigan,P. M. Chadwick,L.-M. Chounet,A. C. Clapson,G. Coignet,R. Cornils,L. Costamante,M. Dalton,B. Degrange,H. J. Dickinson,A. Djannati-Ataï,W. Domainko,Luke Drury,F. Dubois,Guillaume Dubus,J. Dyks,K. Egberts,D. Emmanoulopoulos,P. Espigat,C. Farnier,F. Feinstein,A. Fiasson,A. Förster,G. Fontaine,Stefan Funk,M. Füßling,Y. A. Gallant,B. Giebels,J. F. Glicenstein,B. Glück,P. Goret,Christos Hadjichristidis,D. Hauser,M. Hauser,G. Heinzelmann,G. Henri,G. Hermann,James Hinton,A. Hoffmann,W. Hofmann,M. Holleran,S. Hoppe,Dieter Horns,A. Jacholkowska,O. C. De Jager,I. Jung,K. Katarzyński,E. Kendziorra,M. Kerschhaggl,B. Khélifi,D. Keogh,Nu. Komin,K. Kosack,G. Lamanna,I. J. Latham,A. Lemière,M. Lemoine-Goumard,Jean-Philippe Lenain,T. Lohse,J. M. Martin,O. Martineau-Huynh,A. Marcowith,C. Masterson,David Maurin,G. Maurin,T. J. L. McComb,R. Moderski,Emmanuel Moulin,M. De Naurois,D. Nedbal,S. J. Nolan,S. Ohm,J.-P. Olive,Emma De Ona Wilhelmi,K. J. Orford,J. L. Osborne,M. Ostrowski,M. Panter,G. Pedaletti,G. Pelletier,P.-O. Petrucci,S. Pita,G. Pühlhofer,Michael Punch,S. Ranchon,B. C. Raubenheimer,M. Raue,S. M. Rayner,M. Renaud,J. Ripken,L. Rob,L. Rolland,S. Rosier-Lees,Gavin Rowell,B. Rudak,J. Ruppel,V. Sahakian,A. Santangelo,R. Schlickeiser,F. Schöck,R. Schröder,U. Schwanke,S. Schwarzburg,S. Schwemmer,A. Shalchi,H. Sol,D. Spangler,Ł. Stawarz,R. Steenkamp,C. Stegmann,G. Superina,P. H. Tam,J.-P. Tavernet,R. Terrier,Christopher Van Eldik,G. Vasileiadis,Christo Venter,J. P. Vialle,P. Vincent,M. Vivier,H. J. Völk,F. Volpe,S. J. Wagner,M. Ward,A. A. Zdziarski,A. Zech,Nukri Komin;F. Aharonian;A. G. Akhperjanian;U. Barres De Almeida;A. R. Bazer-Bachi;B. Behera;M. Beilicke;W. Benbow;K. Bernlöhr;C. Boisson;O. Bolz;V. Borrel;I. Braun;E. Brion;A. M. Brown;R. Bühler;Tomasz Bulik;I. Büsching;T. Boutelier;S. Carrigan;P. M. Chadwick;L.-M. Chounet;A. C. Clapson;G. Coignet;R. Cornils;L. Costamante;M. Dalton;B. Degrange;H. J. Dickinson;A. Djannati-Ataï;W. Domainko;Luke Drury;F. Dubois;Guillaume Dubus;J. Dyks;K. Egberts;D. Emmanoulopoulos;P. Espigat;C. Farnier;F. Feinstein;A. Fiasson;A. Förster;G. Fontaine;Stefan Funk;M. Füßling;Y. A. Gallant;B. Giebels;J. F. Glicenstein;B. Glück;P. Goret;Christos Hadjichristidis;D. Hauser;M. Hauser;G. Heinzelmann;G. Henri;G. Hermann;James Hinton;A. Hoffmann;W. Hofmann;M. Holleran;S. Hoppe;Dieter Horns;A. Jacholkowska;O. C. De Jager;I. Jung;K. Katarzyński;E. Kendziorra;M. Kerschhaggl;B. Khélifi;D. Keogh;Nu. Komin;K. Kosack;G. Lamanna;I. J. Latham;A. Lemière;M. Lemoine-Goumard;Jean-Philippe Lenain;T. Lohse;J. M. Martin;O. Martineau-Huynh;A. Marcowith;C. Masterson;David Maurin;G. Maurin;T. J. L. McComb;R. Moderski;Emmanuel Moulin;M. De Naurois;D. Nedbal;S. J. Nolan;S. Ohm;J.-P. Olive;Emma De Ona Wilhelmi;K. J. Orford;J. L. Osborne;M. Ostrowski;M. Panter;G. Pedaletti;G. Pelletier;P.-O. Petrucci;S. Pita;G. Pühlhofer;Michael Punch;S. Ranchon;B. C. Raubenheimer;M. Raue;S. M. Rayner;M. Renaud;J. Ripken;L. Rob;L. Rolland;S. Rosier-Lees;Gavin Rowell;B. Rudak;J. Ruppel;V. Sahakian;A. Santangelo;R. Schlickeiser;F. Schöck;R. Schröder;U. Schwanke;S. Schwarzburg;S. Schwemmer;A. Shalchi;H. Sol;D. Spangler;Ł. Stawarz;R. Steenkamp;C. Stegmann;G. Superina;P. H. Tam;J.-P. Tavernet;R. Terrier;Christopher Van Eldik;G. Vasileiadis;Christo Venter;J. P. Vialle;P. Vincent;M. Vivier;H. J. Völk;F. Volpe;S. J. Wagner;M. Ward;A. A. Zdziarski;A. Zech;Nukri Komin;
Journal astronomy & astrophysics
Year 2007
DOI
10.1051/0004-6361:20078604
URL
https://sciprofiles.com/publication/view/f3b78fda969e15bc2b895e9aa2e900c4
Keywords
gamma ray active galactic nuclei spectral energy distribution

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