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Discovery of Very High Energy γ-Ray Emission from the Low-Frequency-peaked BL Lacertae Object BL Lacertae

J. AlbertUniversität Würzburg, D-97074 Würzburg, GermanyE. AliuInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainH. AnderhubETH Zurich, CH-8093 Zurich, SwitzerlandP. AntoranzUniversidad Complutense, E-28040 Madrid, SpainA. ArmadaInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainC. BaixerasUniversitat Autònoma de Barcelona, E-08193 Bellaterra, SpainJ. A. BarrioUniversidad Complutense, E-28040 Madrid, SpainH. BartkoMax-Planck-Institut für Physik, D-80805 Munich, GermanyD. BastieriUniversità di Padova and INFN, I-35131 Padova, ItalyJ. K. BeckerUniversität Dortmund, D-44227 Dortmund, GermanyW. BednarekUniversity of Łódź, PL-90236 Lodz, PolandK. BergerUniversität Würzburg, D-97074 Würzburg, GermanyC. BigongiariUniversità di Padova and INFN, I-35131 Padova, ItalyA. BilandETH Zurich, CH-8093 Zurich, SwitzerlandR. K. BöckMax-Planck-Institut für Physik, D-80805 Munich, GermanyP. BordasUniversitat de Barcelona, E-08028 Barcelona, SpainV. Bosch-RamónUniversitat de Barcelona, E-08028 Barcelona, SpainT. BretzUniversität Würzburg, D-97074 Würzburg, GermanyI. BritvitchETH Zurich, CH-8093 Zurich, SwitzerlandMontaña CámaraUniversidad Complutense, E-28040 Madrid, SpainE. CarmonaMax-Planck-Institut für Physik, D-80805 Munich, GermanyA. ChilingarianYerevan Physics Institute, AM-375036 Yerevan, ArmeniaJ. A. CoarasaMax-Planck-Institut für Physik, D-80805 Munich, GermanyS. CommichauETH Zurich, CH-8093 Zurich, SwitzerlandJ. L. ContrerasUniversidad Complutense, E-28040 Madrid, SpainJ. CortinaInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainM. T. CostadoInstituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, SpainV. CurtefUniversität Dortmund, D-44227 Dortmund, GermanyV. DanielyanYerevan Physics Institute, AM-375036 Yerevan, ArmeniaF. DazziUniversità di Padova and INFN, I-35131 Padova, ItalyA. De AngelisUniversità di Udine and INFN Trieste, I-33100 Udine, ItalyC. DelgadoInstituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, SpainR. de los ReyesUniversidad Complutense, E-28040 Madrid, SpainB. De LottoUniversità di Udine and INFN Trieste, I-33100 Udine, ItalyE. Domingo-SantamaríaInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainD. DornerUniversität Würzburg, D-97074 Würzburg, GermanyM. DoroUniversità di Padova and INFN, I-35131 Padova, ItalyM. ErrandoInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainM. FagioliniUniversità di Siena and INFN Pisa, I-53100 Siena, ItalyD. FerencUniversity of California, Davis, CA 95616-8677E. FernándezInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainR. FirpoInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainJ. FlixInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainM. V. FonsecaUniversidad Complutense, E-28040 Madrid, SpainL. FontUniversitat Autònoma de Barcelona, E-08193 Bellaterra, SpainM. FuchsMax-Planck-Institut für Physik, D-80805 Munich, GermanyN. GalanteMax-Planck-Institut für Physik, D-80805 Munich, GermanyR. J. Garcı́a LópezInstituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, SpainM. GarczarczykMax-Planck-Institut für Physik, D-80805 Munich, GermanyM. GaugUniversità di Padova and INFN, I-35131 Padova, ItalyM. GillerUniversity of Łódź, PL-90236 Lodz, PolandF. GöebelMax-Planck-Institut für Physik, D-80805 Munich, GermanyD. HakobyanYerevan Physics Institute, AM-375036 Yerevan, ArmeniaM. HayashidaMax-Planck-Institut für Physik, D-80805 Munich, GermanyT. HengstebeckHumboldt-Universität zu Berlin, D-12489 Berlin, GermanyA. HerreroInstituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, SpainD. HöhneUniversität Würzburg, D-97074 Würzburg, GermanyJ. HoseMax-Planck-Institut für Physik, D-80805 Munich, GermanyC. C. HsuMax-Planck-Institut für Physik, D-80805 Munich, GermanyP. JacońUniversity of Łódź, PL-90236 Lodz, PolandT. JoglerMax-Planck-Institut für Physik, D-80805 Munich, GermanyR. KosyraMax-Planck-Institut für Physik, D-80805 Munich, GermanyD. KranichETH Zurich, CH-8093 Zurich, SwitzerlandR. KritzerUniversität Würzburg, D-97074 Würzburg, GermanyA. LailleUniversity of California, Davis, CA 95616-8677E. LindforsS. LombardiUniversità di Padova and INFN, I-35131 Padova, ItalyF. LongoUniversità di Udine and INFN Trieste, I-33100 Udine, ItalyJ. LópezInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainMarcos LópezUniversidad Complutense, E-28040 Madrid, SpainE. LorenzMax-Planck-Institut für Physik, D-80805 Munich, GermanyP. MajumdarMax-Planck-Institut für Physik, D-80805 Munich, GermanyG. ManevaInstitute for Nucl. Research and Nucl. Energy, BG-1784 Sofia, BulgariaK. MannheimUniversität Würzburg, D-97074 Würzburg, GermanyO. MansuttiUniversità di Udine and INFN Trieste, I-33100 Udine, ItalyM. MariottiUniversità di Padova and INFN, I-35131 Padova, ItalyM. Martı́nezInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainD. MazinMax-Planck-Institut für Physik, D-80805 Munich, GermanyC. MerckMax-Planck-Institut für Physik, D-80805 Munich, GermanyM. MeucciUniversità di Siena and INFN Pisa, I-53100 Siena, ItalyM. MeyerUniversität Würzburg, D-97074 Würzburg, GermanyJ. M. MirandaUniversidad Complutense, E-28040 Madrid, SpainR. MirzoyanMax-Planck-Institut für Physik, D-80805 Munich, GermanyS. MizobuchiMax-Planck-Institut für Physik, D-80805 Munich, GermanyA. MoralejoInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainK. NilssonJ. NinkovićMax-Planck-Institut für Physik, D-80805 Munich, GermanyE. de Oña WilhelmiInstitut de Física d'Altes Energies, E-08193 Bellaterra, SpainA. N. OtteHumboldt-Universität zu Berlin, D-12489 Berlin, GermanyD. PanequeMax-Planck-Institut für Physik, D-80805 Munich, GermanyM. PannielloInstituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, SpainR. PaolettiUniversità di Siena and INFN Pisa, I-53100 Siena, ItalyJ. M. ParedesUniversitat de Barcelona, E-08028 Barcelona, SpainM. PasanenD. PascoliUniversità di Padova and INFN, I-35131 Padova, ItalyF. PaussETH Zurich, CH-8093 Zurich, SwitzerlandR. PegnaUniversità di Siena and INFN Pisa, I-53100 Siena, ItalyM. PersicINAF-Osservatorio Astronomico and INFN Trieste, I-34131 Trieste, ItalyL. PeruzzoUniversità di Padova and INFN, I-35131 Padova, Italy
2007en
ABI

Annotatsiya

The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to December and for 26 hr during 2006 July to September. The source is the historical prototype and eponym of a class of low-frequency-peaked BL Lacertae (LBL) objects. A very high energy (VHE) g-ray signal was discovered with a 5.1 j excess in the 2005 data. Above 200 GeV, an integral flux of was measured, corresponding to approximately 3% 11 2 1

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