Bibcode
Anderhub, H.; Antonelli, L. A.; Antoranz, P.; Backes, M.; Baixeras, C.; Balestra, S.; Barrio, J. A.; Bartko, H.; Bastieri, D.; Becerra González, J.; Becker, J. K.; Bednarek, W.; Berger, K.; Bernardini, E.; Biland, A.; Bock, R. K.; Bonnoli, G.; Bordas, P.; Borla Tridon, D.; Bosch-Ramon, V.; Bretz, T.; Britvitch, I.; Camara, M.; Carmona, E.; Commichau, S.; Contreras, J. L.; Cortina, J.; Costado, M. T.; Covino, S.; Curtef, V.; Dazzi, F.; de Angelis, A.; de Cea Del Pozo, E.; de Los Reyes, R.; de Lotto, B.; de Maria, M.; de Sabata, F.; Delgado Mendez, C.; Dominguez, A.; Dorner, D.; Doro, M.; Elsaesser, D.; Errando, M.; Ferenc, D.; Fernández, E.; Firpo, R.; Fonseca, M. V.; Font, L.; Galante, N.; García López, R. J.; Garczarczyk, M.; Gaug, M.; Goebel, F.; Hadasch, D.; Hayashida, M.; Herrero, A.; Höhne-Mönch, D.; Hose, J.; Hsu, C. C.; Huber, S.; Jogler, T.; Kranich, D.; La Barbera, A.; Laille, A.; Leonardo, E.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Meucci, M.; Meyer, M.; Miranda, J. M.; Mirzoyan, R.; Moldón, J.; Moles, M.; Moralejo, A.; Nieto, D.; Nilsson, K.; Ninkovic, J.; Otte, N.; Oya, I.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauss, F.; Pegna, R. G.; Perez-Torres, M. A.; Persic, M.; Peruzzo, L.; Prada, F. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 498, Issue 1, 2009, pp.83-87
Advertised on:
4
2009
Journal
Citations
17
Refereed citations
15
Description
Aims: We report upper limits to the very high energy flux (E>100 GeV)
of the flat spectrum radio quasar 3C 454.3 (z=0.859) derived by the
Cherenkov telescope MAGIC during the high states of July/August and
November/December 2007. We compare the upper limits derived in both time
slots with the available quasi-simultaneous MeV-GeV data from the AGILE
γ-ray satellite and interpret the observational results in the
context of leptonic emission models. Methods: The source was
observed with the MAGIC telescope during the active phases of
July-August 2007 and November-December 2007 and the data were analyzed
with the MAGIC standard analysis tools. For the periods around the ends
of July and November, characterized by the most complete multifrequency
coverage, we constructed the spectral energy distributions using our
data together with nearly simultaneous multifrequency (optical, UV,
X-ray and GeV) data. Results: Only upper limits can be derived
from the MAGIC data. The upper limits, once corrected for the expected
absorption by the extragalactic background light, together with nearly
simultaneous multifrequency data, allow us to constrain the spectral
energy distribution of 3C 454.3. The data are consistent with the model
expectations based on inverse Compton scattering of the ambient photons
from the broad line region by relativistic electrons, which robustly
predicts a sharp cut-off above 20-30 GeV.
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