Details

Autor(en) / Beteiligte

• 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.

Titel

MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007

Ist Teil von

• Astronomy and astrophysics (Berlin), 2012-08, Vol.544, p.A96

Ort / Verlag

Les Ulis: EDP Sciences

Erscheinungsjahr

2012

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.