Search for extended γ-ray emission around AGN with HESS and Fermi-LAT

被引:43
作者
Abramowski, A. [1 ]
Aharonian, F. [2 ,3 ,4 ]
Benkhali, F. Ait [2 ]
Akhperjanian, A. G. [4 ,5 ]
Anguener, E. [6 ]
Anton, G. [7 ]
Backes, M. [8 ]
Balenderan, S. [9 ]
Balzer, A. [10 ,11 ]
Barnacka, A. [12 ]
Becherini, Y. [13 ]
Tjus, J. Becker [14 ]
Bernloehr, K. [2 ,6 ]
Birsin, E. [6 ]
Bissaldi, E. [15 ]
Biteau, J. [16 ]
Boettcher, M. [17 ]
Boisson, C. [18 ]
Bolmont, J. [19 ]
Bordas, P. [20 ]
Brucker, J. [7 ]
Brun, F. [2 ]
Brun, P. [21 ]
Bulik, T. [22 ]
Carrigan, S. [2 ]
Casanova, S. [2 ,17 ]
Chadwick, P. M. [9 ]
Chalme-Calvet, R. [19 ]
Chaves, R. C. G. [21 ]
Cheesebrough, A. [9 ]
Chretien, M. [19 ]
Colafrancesco, S. [23 ]
Cologna, G. [24 ]
Conrad, J. [2 ,26 ]
Couturier, C. [19 ]
Cui, Y. [20 ]
Djannati-Atai, A. [29 ]
Domainko, W. [2 ]
Drury, L. O'C. [3 ]
Dubus, G. [30 ]
Dutson, K. [31 ]
Dyks, J. [12 ]
Dyrda, M. [32 ]
Edwards, T. [2 ]
Egberts, K. [15 ]
Eger, P. [2 ]
Espigat, P. [29 ]
Farnier, C. [25 ]
Fegan, S. [16 ]
Feinstein, F. [33 ]
机构
[1] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany
[2] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[3] Dublin Inst Adv Studies, Dublin 2, Ireland
[4] Natl Acad Sci Republ Armenia, Yerevan, Armenia
[5] Yerevan Phys Inst, Yerevan 375036, Armenia
[6] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[7] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany
[8] Univ Namibia, Dept Phys, Windhoek, Namibia
[9] Univ Durham, Dept Phys, Durham DH1 3LE, England
[10] DESY, D-15738 Zeuthen, Germany
[11] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany
[12] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
[13] Linnaeus Univ, Dept Phys & Elect Engn, S-35195 Vaxjo, Sweden
[14] Ruhr Univ Bochum, Inst Theoret Phys, D-44780 Bochum, Germany
[15] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[16] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France
[17] North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa
[18] Univ Paris Diderot, CNRS, LUTH, Observ Paris, F-92190 Meudon, France
[19] Univ Paris 06, Univ Denis Diderot Paris 7, CNRS IN2P3, LPNHE, F-75252 Paris, France
[20] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany
[21] CEA Saclay, DSM Irfu, F-91191 Gif Sur Yvette, France
[22] Univ Warsaw, Astron Observ, PL-00478 Warsaw, Poland
[23] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa
[24] Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany
[25] Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Dept Phys, S-10691 Stockholm, Sweden
[26] Wallenberg Acad, Stockholm, Sweden
[27] Univ Bordeaux 1, CNRS, IN2P3, Ctr Etudes Nucl Bordeaux Gradignan, F-33175 Gradignan, France
[28] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia
[29] Univ Paris Diderot, CNRS IN2P3, APC, Observ Paris,Sorbonne Paris Cite, F-75205 Paris, France
[30] UJF Grenoble 1, CNRS INSU, IPAG, UMR 5274, F-38041 Grenoble, France
[31] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[32] Inst Fizyki Jadrowej PAN, PL-31342 Krakow, Poland
[33] Univ Montpellier 2, CNRS, IN2P3, Lab Univ & Particules Montpellier, F-34095 Montpellier, France
[34] Univ Savoie, CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France
[35] Uniwersytet Jagiellonski, Astron Observ, PL-30244 Krakow, Poland
[36] Nicholas Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland
[37] Univ Free State, Dept Phys, ZA-9300 Bloemfontein, South Africa
[38] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, CR-18000 Prague 8, Czech Republic
基金
新加坡国家研究基金会; 英国科学技术设施理事会;
关键词
gamma rays: galaxies; galaxies: magnetic fields; intergalactic medium; BL Lacertae objects: individual: PKS 2155-304; BL Lacertae objects: individual: lES 1101-232; BL Lacertae objects: individual: lES 0229+200; EXTRAGALACTIC MAGNETIC-FIELDS; LARGE-AREA TELESCOPE; ACTIVE GALACTIC NUCLEI; BACKGROUND-RADIATION; TEV BLAZARS; PAIR BEAMS; EVOLUTION; CONSTRAINTS; ABSORPTION; GENERATION;
D O I
10.1051/0004-6361/201322510
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 the proximity of the source, the cascade initiated from pair production can result in either an isotropic halo around an initially- beamed source or a magnetically- broadened cascade :aux. Aims. Both extended pair-halo (PH) and magnetically broadened cascade (MBC) emission from regions surrounding the blazars 1ES 1101-232, IRS 0229+200, and PKS 2155-304 were searched for using VHE y-ray data taken with the High Energy Stereoscopic System (HESS.) and high-energy (HE; 100 MeV < E < 100 GeV) gamma-ray data with the Fermi Large Area Telescope (LAT). Methods. By comparing the angular distributions of the reconstructed gamma-ray events to the angular profiles calculated from detailed theoretical models, the presence of PH and MBC was investigated. Results. Upper limits on the extended emission around lES 1101-232, lES 0229+200, and PKS 2155-304 are found to be at a level of a few per cent of the Crab nebula flux above 1 TeV, depending on the assumed photon index of the cascade emission. Assuming strong extra-Galactic magnetic field (EGME) values, >10(-12) G, this limits the production of pair haloes developing from electromagnetic cascades. For weaker magnetic fields, in which electromagnetic cascades would result in MBCs. EGMF strengths in the range (0.3-3) x 10(-15) G were excluded for PKS 2155-304 at the 99% confidence level, under the assumption of a 1 Mpc coherence length.
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页数:10
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