Abstract
Flat spectrum radio quasars (FSRQs), a subclass of blazars, are characterized by a steep γ-ray spectrum which makes their detection in the very high energy domain (VHE, >100 GeV) challenging. Up to Feb 2013 there are only three FSRQs unambiguously discovered in this energy regime, all three detected at least once by MAGIC, a stereoscopic system of two Imaging Atmospheric Cherenkov Telescopes located on La Palma, Canary islands. Here we present the latest MAGIC results together with simultaneous multiwavelength observations on two out of the three FSRQs, 3C 279 and PKS 1510-089. 3C 279 (z=0.536) was observed by the MAGIC telescopes as part of two distinct campaigns in 2011: regular monitoring between February and April and follow up observations in June after high activity in optical regime and high energy γ rays (HE, 100 MeV-100 GeV). None of the campaigns resulted in a significant detection at VHE, consequently upper limits on the flux in the energy range 125−500 GeV have been computed. PKS 1510-089 (z=0.36) was observed with the MAGIC telescopes from February to April 2012, as follow up observations after alerts from Fermi-LAT and AGILE collaborations. We detected the source in the VHE regime at >5 sigma significance. We complement MAGIC observations of 3C 279 and PKS 1510-089 with simultaneous multiwavelength observations in high-energy γ rays, X-rays, optical and radio wavelengths and polarization observations. With this study of the spectral and variability features observed from radio to VHE γ rays, we aim at identifying the physical processes responsible for the emission from this class of sources.
| Original language | English |
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| Title of host publication | Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 |
| Publisher | Sociedade Brasileira de Fisica |
| ISBN (Electronic) | 9788589064293 |
| Publication status | Published - 1 Jan 2013 |
| Event | 33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil Duration: 2 Jul 2013 → 9 Jul 2013 |
Publication series
| Name | Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 |
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| Volume | 2013-October |
Conference
| Conference | 33rd International Cosmic Rays Conference, ICRC 2013 |
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| Country/Territory | Brazil |
| City | Rio de Janeiro |
| Period | 2/07/13 → 9/07/13 |
Funding
Acknowledgments:We would like to thank the Instituto de Astrofísica 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, the Swiss National Fund SNF, and the Spanish MICINN is gratefully acknowledged. This work was also supported by the CPAN CSD2007-00042 and MultiDark CSD2009-00064 projects of the Spanish Consolider-Ingenio 2010 programme, by grant DO02-353 of the Bulgarian NSF, by grant 127740 of the Academy of Finland, by the DFG Cluster of Excellence “Origin and Structure of the Universe”, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, and by the Polish MNiSzW grant 745/N-HESS-MAGIC/2010/0. The Fermi-LAT Collaboration acknowledges support from a number of agencies and institutes for both development and the operation of the LAT as well as scientific data analysis. These include NASA and DOE in the United States, CEA/Irfu and IN2P3/CNRS in France, ASI and INFN in Italy, MEXT, KEK, and JAXA in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the National Space Board in Sweden. Additional support from INAF in Italy and CNES in France for science analysis during the operations phase is also gratefully acknowledged.The ICRC 2013 is funded by FAPERJ, CNPq, FAPESP, CAPES and IUPAP.
Keywords
- 3C 279
- FSRQs
- Gamma rays
- Multiwavelength
- PKS 1510-089
ASJC Scopus subject areas
- Nuclear and High Energy Physics