Bibcode
Aleksić, J.; Alvarez, E. A.; Antonelli, L. A.; Antoranz, P.; Asensio, M.; Backes, M.; Barrio, J. A.; Bastieri, D.; Becerra-González, J.; Bednarek, W.; Berdyugin, A.; Berger, K.; Bernardini, E.; Biland, A.; Blanch, O.; Bock, R. K.; Boller, A.; Bonnoli, G.; Borla Tridon, D.; Braun, I.; Bretz, T.; Cañellas, A.; Carmona, E.; Carosi, A.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Cossio, L.; Covino, S.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Cea del Pozo, E.; De Lotto, B.; Delgado-Mendez, C.; Diago-Ortega, A.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Elsaesser, D.; Ferenc, D.; Fonseca, M. V.; Font, L.; Fruck, C.; García-López, R. J.; Garczarczyk, M.; Garrido, D.; Gaug, M.; Giavitto, G.; Godinović, N.; Hadasch, D.; Häfner, D.; Herrero, A.; Hildebrand, D.; Höhne-Mönch, D.; Hose, J.; Hrupec, D.; Huber, B.; Jogler, T.; Kellermann, H.; Klepser, S.; Krähenbühl, T.; Krause, J.; La Barbera, A.; Lelas, D.; Leonardo, E.; Lindfors, E.; Lombardi, S.; López, M.; López-Oramas, A.; Lorenz, E.; Makariev, M.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Miyamoto, H.; Moldón, J.; Moralejo, A.; Munar-Adrover, P.; Nieto, D.; Nilsson, K.; Orito, R.; Oya, I.; Paneque, D.; Paoletti, R.; Pardo, S.; Paredes, J. M.; Partini, S.; Pasanen, M.; Pauss, F. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 544, id.A96
Advertised on:
8
2012
Journal
Citations
26
Refereed citations
20
Description
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.
Related projects
Particle Astrophysics
The MAGIC Collaboration is integrated by 20 research institutes and university departments from Armenia, Bulgaria, Finland, Germany, Italy, Poland, Spain, Switzerland and USA. The collaboration comprises two 17m diameter telescopes, located at the Roque de los Muchachos Observatory, designed to measure the Cherenkov radiation associated with
Ramón
García López