RT Journal Article
T1 MAGIC upper limits to the VHE gamma-ray flux of 3C 454.3 in high emission state
A1 Antoranz Canales, Pedro
A1 Barrio Uña, Juan Abel
A1 Contreras González, José Luis
A1 Fonseca González, María Victoria
A1 Miranda Pantoja, José Miguel
A1 Nieto Castaño, Daniel
AB 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.
PB EDP Sciencies
SN 0004-6361
YR 2009
FD 2009-04
LK https://hdl.handle.net/20.500.14352/43959
UL https://hdl.handle.net/20.500.14352/43959
LA eng
NO © ESO 2009. We thank the anonymous referee for comments. We would like to thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma.The support of the German BMBF and MPG, the Italian INFN and Spanish MCINN is gratefully acknowledged. This work was also supported by ETH Research Grant TH 34/043, by the Polish MNiSzW Grant N N203 390834, and by the YIP of the Helmholtz Gemeinschaft. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the JetPropulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
NO German BMBF
NO MPG
NO Italian INFN
NO Spanish MCINN
NO Polish MNiSzW
NO ETH
NO Helmholtz Gemeinschaft
DS Docta Complutense
RD 5 abr 2025