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 (σ = 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. © 2012 International Astronomical Union.
González, J.B., Maraschi, L., Mazin, D., Prandini, E., Saito, K., Sitarek, J., et al. (2012). Very high energy γ-radiation from the radio quasar 4C 21.35. In Proceedings of the International Astronomical Union (pp.414-416). CAMBRIDGE UNIV PRESS [10.1017/S1743921312009544].
Very high energy γ-radiation from the radio quasar 4C 21.35
Stamerra, Antonio;
2012-01-01
Abstract
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 (σ = 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. © 2012 International Astronomical Union.
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https://hdl.handle.net/11365/41344
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