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Aleksić, J.; Alvarez, E. A.; Antonelli, L. A.; Antoranz, P.; Asensio, M.; Backes, M.; Bastieri, D.; Bednarek, W.; Biland, A.; Bock, R. K.; Bonnoli, G.; Borla Tridon, D.; Braun, I.; Bretz, T.; Cañellas, A.; Colin, P.; Contreras, J. L.; Cortina, J.; Cossio, L.; Dazzi, F.; De Angelis, A.; De Caneva, G.; Delgado Mendez, C.; Doert, M.; Domínguez, A.; Dorner, D.; Doro, M.; García López, R. J.; Garczarczyk, M.; Garrido, D.; Giavitto, G.; Godinović, N.; Häfner, D.; Herrero, A.; Kellermann, H.; Klepser, S.; Krähenbühl, T.; Krause, J.; Leonardo, E.; López, M.; López-Oramas, A.; Makariev, M.; Maneva, G.; Maraschi, L.; Mariotti, M.; Martínez, M.; Meucci, M.; Miyamoto, H.; Moldón, J.; Munar-Adrover, P.; Nieto, D.; Nilsson, K.; Orito, R.; Oya, I.; Paneque, D.; Paoletti, R.; Pardo, S.; Paredes, J. M.; Partini, S.; Pauss, F.; Perez-Torres, M. A.; Persic, M.; Peruzzo, L.; Prada, F.; Prada Moroni, P. G.; Prandini, E.; Reichardt, I.; Rhode, W.; Rico, J.; Rügamer, S.; Saito, T. Y.; Scapin, V.; Schultz, C.; Shayduk, M.; Shore, S. N.; Sillanpää, A.; Spanier, F.; Spiro, S.; Stamerra, A.; Steinke, B.; Storz, J.; Strah, N.; Surić, T.; Takalo, L.; Takami, H.; Temnikov, P.; Terzić, T.; Tescaro, D.; Teshima, M.; Tibolla, O.; Torres, D. F.; Treves, A.; Uellenbeck, M.; Vankov, H.; Vogler, P.; Wagner, R. M.; Zabalza, V.; Zandanel, F.; Zanin, R.; Ghisellini, G.
Astronomy & astrophysics, 08/2012, Volume: 544Journal Article
Context. We present the results of a long M 87 monitoring campaign in very high energy γ-rays with the MAGIC-I Cherenkov telescope. Aims. We aim to model the persistent non-thermal jet emission by monitoring and characterizing the very high energy γ-ray emission of M 87 during a low state. Methods. A total of 150 h of data were taken between 2005 and 2007 with the single MAGIC-I telescope, out of which 128.6 h survived the data quality selection. We also collected data in the X-ray and Fermi-LAT bands from the literature (partially contemporaneous). Results. No flaring activity was found during the campaign. The source was found to be in a persistent low-emission state, which was at a confidence level of 7σ. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a photon index Γ = 2.21 ± 0.21 and a flux normalization at 300 GeV of (7.7 ± 1.3) × 10-8 TeV-1 s-1 m-2. The extrapolation of the MAGIC spectrum into the GeV energy range matches the previously published Fermi-LAT spectrum well, covering a combined energy range of four orders of magnitude with the same spectral index. We model the broad band energy spectrum with a spine layer model, which can satisfactorily describe our data.
