Abramowski A, Aharonian F, Benkhali FA, Akhperjanian AG, Anguener E, Anton G, Backes M, Balenderan S, Balzer A, Barnacka A, Becherini Y, Tjus JB, Bernloehr K, Birsin E, Bissaldi E, Biteau J, Boettcher M, Boisson C, Bolmont J, Bordas P, Brucker J, Brun F, Brun P, Bulik T, Carrigan S, Casanova S, Chadwick PM, Chalme-Calvet R, Chaves RCG, Cheesebrough A, Chretien M, Colafrancesco S, Cologna G, Conrad J, Couturier C, Cui Y, Djannati-Atai A, Domainko W, Drury LO, Dubus G, Dutson K, Dyks J, Dyrda M, Edwards T, Egberts K, Eger P, Espigat P, Farnier C, Fegan S, Feinstein F, Fernandes MV, Fernandez D, Fiasson A, Fontaine G, Foerster A, Fussling M, Gajdus M, Gallant YA, Garrigoux T, Giavitto G, Giebels B, Glicenstein JF, Grondin MH, Grudzinska M, Häffner S, Hahn J, Harris J, Heinzelmann G, Henri G, Hermann G, Hervet O, Hillert A, Hinton JA, Hofmann W, Hofverberg P, Holler M, Horns D, Jacholkowska A, Jahn C, Jamrozy M, Janiak M, Jankowsky F, Jung I, Kastendieck MA, Katarzynski K, Katz U, Kaufmann S, Khelifi B, Kieffer M, Klepser S, Klochkov D, Kluzniak W, Kneiske T, Kolitzus D, Komin N, Kosack K, Krakau S, Krayzel F, Krueger PP, Laffon H, Lamanna G, Lefaucheur J, Lemiere A, Lemoine-Goumard M, Lenain JP, Lohse T, Lopatin A, Lu CC, Marandon V, Marcowith A, Marx R, Maurin G, Maxted N, Mayer M, Mccomb TJL, Mehault J, Meintjes PJ, Menzler U, Meyer M, Moderski R, Mohamed M, Moulin E, Murach T, Naumann CL, De Naurois M, Niemiec J, Nolan SJ, Oakes L, Odaka H, Ohm S, Wilhelmi EDO, Opitz B, Ostrowski M, Oya I, Panter M, Parsons RD, Arribas MP, Pekeur NW, Pelletier G, Perez J, Petrucci PO, Peyaud B, Pita S, Poon H, Puehlhofer G, Punch M, Quirrenbach A, Raab S, Raue M, Reichardt I, Reimer A, Reimer O, Renaud M, Reyes RDL, Rieger F, Rob L, Romoli C, Rosier-Lees S, Rowell G, Rudak B, Rulten CB, Sahakian V, Sanchez DA, Santangelo A, Schlickeiser R, Schuessler F, Schulz A, Schwanke U, Schwarzburg S, Schwemmer S, Sol H, Spengler G, Spies F, Stawarz L, Steenkamp R, Stegmann C, Stinzing F, Stycz K, Sushch I, Tavernet JP, Tavernier T, Taylor AM, Terrier R, Tluczykont M, Trichard C, Valerius K, van Eldik C, Van Soelen B, Vasileiadis G, Venter C, Viana A, Vincent P, Voelk HJ, Volpe F, Vorster M, Vuillaume T, Wagner SJ, Wagner P, Wagner RM, Ward M, Weidinger M, Weitzel Q, White R, Wierzcholska A, Willmann P, Wörnlein A, Wouters D, Yang R, Zabalza V, Zacharias M, Zdziarski AA, Zech A, Zechlin HS, Malyshev D (2014)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2014
Publisher: EDP Sciences
Book Volume: 562
Article Number: A145
DOI: 10.1051/0004-6361/201322510
Context. Very-high-energy (VHE; E > 100 GeV) γ-ray emission from blazars inevitably gives rise to electron-positron pair production through the interaction of these γ-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 flux. Aims. Both extended pair-halo (PH) and magnetically broadened cascade (MBC) emission from regions surrounding the blazars 1ES 1101-232, 1ES 0229+200, and PKS 2155-304 were searched for using VHE γ-ray data taken with the High Energy Stereoscopic System (H.E.S.S.) and high-energy (HE; 100 MeV < E < 100 GeV) γ-ray data with the Fermi Large Area Telescope (LAT). Methods. By comparing the angular distributions of the reconstructed γ-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 1ES 1101-232, 1ES 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 (EGMF) values, >10 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) × 10 G were excluded for PKS 2155-304 at the 99% confidence level, under the assumption of a 1 Mpc coherence length. © ESO, 2014.
APA:
Abramowski, A., Aharonian, F., Benkhali, F.A., Akhperjanian, A.G., Anguener, E., Anton, G.,... Malyshev, D. (2014). Search for extended γ-ray emission around AGN with H.E.S.S. and Fermi -LAT. Astronomy & Astrophysics, 562. https://doi.org/10.1051/0004-6361/201322510
MLA:
Abramowski, A., et al. "Search for extended γ-ray emission around AGN with H.E.S.S. and Fermi -LAT." Astronomy & Astrophysics 562 (2014).
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