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

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 app...

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Published in:Proceedings of the International Astronomical Union 2011-09, Vol.7 (S284), p.414-416
Main Authors: González, Josefa Becerra, Maraschi, Laura, Mazin, Daniel, Prandini, Elisa, Saito, Koji, Sitarek, Julian, Stamerra, Antonio, Tavecchio, Fabrizio, Terzić, Tomislav, Treves, Aldo
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Language:English
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Summary: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.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921312009544