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Very high energy γ-radiation from the radio quasar 4C 21.35

Published online by Cambridge University Press:  17 August 2012

Josefa Becerra González ,
Laura Maraschi ,
Daniel Mazin ,
Elisa Prandini ,
Koji Saito ,
Julian Sitarek ,
Antonio Stamerra ,
Fabrizio Tavecchio ,
Tomislav Terzić  and
Aldo Treves
Josefa Becerra González
Affiliation:
Inst. de Astrofsica de Canarias, E-38200 La Laguna, Tenerife, Spain Depto. de Astrofsica, Universidad de La Laguna, E-38206 La Laguna, Spain
Laura Maraschi
Affiliation:
INAF National Institute for Astrophysics, I-00136 Rome, Italy
Daniel Mazin
Affiliation:
IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain Max-Planck-Institut fr Physik, D-80805 Mnchen, Germany
Elisa Prandini
Affiliation:
Universit di Padova and INFN, I-35131 Padova, Italy
Koji Saito
Affiliation:
Max-Planck-Institut fr Physik, D-80805 Mnchen, Germany
Julian Sitarek
Affiliation:
University of d, PL-90236 Lodz, Poland
Antonio Stamerra
Affiliation:
Universit di Siena, and INFN Pisa, I-53100 Siena, Italy
Fabrizio Tavecchio
Affiliation:
INAF National Institute for Astrophysics, I-00136 Rome, Italy
Tomislav Terzić
Affiliation:
University of Rijeka, HR-51000 Rijeka, Croatia, email: tterzic@phy.uniri.hr
Aldo Treves
Affiliation:
Universit dellnsubria, Como, I-22100 Como, Italy
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Abstract

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A very high energy (VHE) γ-radiation was detected from a flat spectrum radio quasar (FSRQ) 4C 21.35 (PKS1222+21) by MAGIC (Major Atmospheric Gamma Imaging Cherenkov) telescopes on June 17th 2010. 4C 21.35 is only the 3rd FSRQ detected in VHE γ-rays. With its hard spectrum (Γ = 2.72±0.34) with no apparent cut-off at energies below 130 GeV and an extremely fast variation of flux (doubling in 8.6+1.1−0.9 minutes), this detection poses a challenge to existing models of VHE γ-radiation from FSRQs. The most important results of observations performed by MAGIC telescopes are presented here, as well as some possible explanations of those results.

Keywords

4C 21.35PKS 1222+216MAGICgamma-rays

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