Aims. We report upper limits to the very high energy flux (E > 100 GeV) of the flat spectrum radio quasar 3C454.3 (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 gamma-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.
MAGIC upper limits to the VHE gamma-ray flux of 3C 454.3 in high emission state / Anderhub H; Antonelli LA; Antoranz P; Backes M; Baixeras C; Balestra S; Barrio JA; Bartko H; Bastieri D; Gonzalez JB; Becker JK; Bednarek W; Berger K; Bernardini E; Biland A; Bock RK; Bonnoli G; Bordas P; Tridon DB; Bosch-Ramon V; Bretz T; Britvitch I; Camara M; Carmona E; Commichau S; Contreras JL; Cortina J; Costado MT; Covino S; Curtef V; Dazzi F; De Angelis A; del Pozo ED; de los Reyes R; De Lotto B; De Maria M; De Sabata F; Mendez CD; Dominguez A; Dorner D; Doro M; Elsaesser D; Errando M; Ferenc D; Fernandez E; Firpo R; Fonseca MV; Font L; Galante N; Lopez RJG; Garczarczyk M; Gaug M; Goebel F; Hadasch D; Hayashida M; Herrero A; Hohne-Monch D; Hose J; Hsu CC; Huber S; Jogler T; Kranich D; La Barbera A; Laille A; Leonardo E; Lindfors E; Lombardi S; Longo F; Lopez M; Lorenz E; Majumdar P; Maneva G; Mankuzhiyil N; Mannheim K; Maraschi L; Mariotti M; Martinez M; Mazin D; Meucci M; Meyer M; Miranda JM; Mirzoyan R; Moldon J; Moles M; Moralejo A; Nieto D; Nilsson K; Ninkovic J; Otte N; Oya I; Paoletti R; Paredes JM; Pasanen M; Pascoli D; Pauss F; Pegna RG; Perez-Torres MA; Persic M; Peruzzo L; Prada F; Prandini E; Puchades N; Rhode W; Ribo M; Rico J; Rissi M; Robert A; Rugamer S; Saggion A; Saito TY; Salvati M; Sanchez-Conde M; Sartori P; Satalecka K; Scalzotto V; Scapin V; Schweizer T; Shayduk M; Shinozaki K; Shore SN; Sidro N; Sierpowska-Bartosik A; Sillanpaa A; Sitarek J; Sobczynska D; Spanier F; Stamerra A; Stark LS; Takalo L; Tavecchio F; Temnikov P; Tescaro D; Teshima M; Tluczykont M; Torres DF; Turini N; Vankov H; Venturini A; Vitale V; Wagner RM; Wittek W; Zabalza V; Zandanel F; Zanin R; Zapatero J; Vercellone S; Donnarumma I; DAmmando F; Tavani M. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 498:1(2009), pp. 83-87. [10.1051/0004-6361/200811326]
MAGIC upper limits to the VHE gamma-ray flux of 3C 454.3 in high emission state
D'AMMANDO, FILIPPO;
2009
Abstract
Aims. We report upper limits to the very high energy flux (E > 100 GeV) of the flat spectrum radio quasar 3C454.3 (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 gamma-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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
