Bibcode
DOI
Albert, J.; Aliu, E.; Anderhub, H.; Antoranz, P.; Armada, A.; Asensio, M.; Baixeras, C.; Barrio, J. A.; Bartko, H.; Bastieri, D.; Becker, J.; Bednarek, W.; Berger, K.; Bigongiari, C.; Biland, A.; Bock, R. K.; Bordas, P.; Bosch-Ramon, V.; Bretz, T.; Britvitch, I.; Camara, M.; Carmona, E.; Chilingarian, A.; Ciprini, S.; Coarasa, J. A.; Commichau, S.; Contreras, J. L.; Cortina, J.; Curtef, V.; Danielyan, V.; Dazzi, F.; De Angelis, A.; de los Reyes, R.; De Lotto, B.; Domingo-Santamaría, E.; Dorner, D.; Doro, M.; Errando, M.; Fagiolini, M.; Ferenc, D.; Fernández, E.; Firpo, R.; Flix, J.; Fonseca, M. V.; Font, L.; Fuchs, M.; Galante, N.; Garczarczyk, M.; Gaug, M.; Giller, M.; Goebel, F.; Hakobyan, D.; Hayashida, M.; Hengstebeck, T.; Höhne, D.; Hose, J.; Hsu, C. C.; Jacon, P.; Jogler, T.; Kalekin, O.; Kosyra, R.; Kranich, D.; Kritzer, R.; Laatiaoui, M.; Laille, A.; Liebing, P.; Lindfors, E.; Lombardi, S.; Longo, F.; López, J.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mannheim, K.; Mansutti, O.; Mariotti, M.; Martínez, M.; Mazin, D.; Merck, C.; Meucci, M.; Meyer, M.; Miranda, J. M.; Mirzoyan, R.; Mizobuchi, S.; Moralejo, A.; Nilsson, K.; Ninkovic, J.; Oña-Wilhelmi, E.; Orduña, R.; Otte, N.; Oya, I.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauss, F.; Pegna, R.; Persic, M. et al.
Referencia bibliográfica
The Astrophysical Journal, Volume 663, Issue 1, pp. 125-138.
Advertised on:
7
2007
Revista
Número de citas
141
Número de citas referidas
124
Descripción
The MAGIC telescope took data of very high energy γ-ray emission
from the blazar Markarian 421 (Mrk 421) between 2004 November and 2005
April. We present a combined analysis of data samples recorded under
different observational conditions, down to γ-ray energies of 100
GeV. The flux was found to vary between 0.5 and 2 crab (integrated above
200 GeV), considered a low state when compared to known data. Although
the flux varied day by day, no short-term variability was observed,
although there is some indication that not all nights show an equally
quiescent state. The results at higher energies were found to be
consistent with previous observations. A clear correlation is observed
between γ-ray and X-ray fluxes, whereas no significant correlation
between γ-ray and optical data is seen. The spectral energy
distribution between 100 GeV and 3 TeV shows a clear deviation from a
power law, more clearly and at lower flux than previous observations at
higher energies. The deviation persists after correcting for the effect
of attenuation by the extragalactic background light, and most likely is
source-inherent. There is a rather clear indication of an inverse
Compton peak around 100 GeV. The spectral energy distribution of Mrk 421
can be fitted by a one-zone synchrotron self-Compton model, suggesting
once again a leptonic origin of the very high energy γ-ray
emission from this blazar.