Preprint Article Version 1 NOT YET PEER-REVIEWED

Broad Band Observations Of Gravitationally Lensed Blazar QSO B0218+357 During A Gamma-Ray Outburst

  1. University of Lodz, PL-90236 Lodz, Poland
  2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  3. Department of Physics and Department of Astronomy, University of Maryland, College Park, MD 20742, USA
  4. Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  5. University of Maryland Baltimore County/CRESST, Baltimore, MD 21250, USA
  6. Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka, 51000, Rijeka, Croatia
  7. University of Zagreb, Croatia
  8. University of Split, Croatia
  9. Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
  10. Universidad de La Laguna, Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain
  11. ICRR, The University of Tokyo, Japan
  12. Max-Planck-Institut für Physik, D-80805 München, Germany
  13. Tuorla Observatory, University of Turku and Astronomy Division, Finland
  14. Universidad Complutense, E-28040 Madrid, Spain
  15. INAF National Institute for Astrophysics, I-00136 Rome, Italy
Version 1 : Received: 12 July 2016 / Approved: 13 July 2016 / Online: 13 July 2016 (05:36:15 CEST)

A peer-reviewed article of this Preprint also exists.

Sitarek, J.; Becerra González, J.; Buson, S.; Dominis Prester, D.; Manganaro, M.; Mazin, D.; Nilsson, K.; Nievas, M.; Stamerra, A.; Tavecchio, F.; Vovk, I. Broad Band Observations of Gravitationally Lensed Blazar during a Gamma-Ray Outburst. Galaxies 2016, 4, 31. Sitarek, J.; Becerra González, J.; Buson, S.; Dominis Prester, D.; Manganaro, M.; Mazin, D.; Nilsson, K.; Nievas, M.; Stamerra, A.; Tavecchio, F.; Vovk, I. Broad Band Observations of Gravitationally Lensed Blazar during a Gamma-Ray Outburst. Galaxies 2016, 4, 31.

Journal reference: Galaxies 2016, 4, 31
DOI: 10.3390/galaxies4040031

Abstract

QSO B0218+357 is a blazar located at a cosmological redshift of 0.944. The source is gravitationally lensed by a spiral galaxy located at the redshift of 0.68. Strong gravitational lensing splits the signals emitted by the source into two components separated by 10-12 days, as observed in radio and gamma-ray bands. In July 2014 a GeV flare was observed by Fermi-LAT, triggering follow-up observations with the MAGIC telescopes at energies above 100 GeV. The expected time delay between the components allowed us to plan broad band MWL observations before, during and after the trailing component of the emission. The MAGIC observations at the expected time of arrival of the trailing component resulted in the first detection of QSO B0218+357 in Very-High-Energy (VHE, >100 GeV) gamma rays. It is both the farthest known VHE object and one of only a few Flat Spectrum Radio Quasars detected in this energy range. We report here the observed multiwavelength spectral and temporal properties of the emission during the 2014 flare.

Subject Areas

Gamma rays: galaxies; Gravitational lensing: strong; Galaxies: jets; Radiation mechanisms: non-thermal; Galaxies: individual: QSO B0218+357

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