Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Julian Sitarek
* ORCID logo ,
Josefa Becerra González
,
Sara Buson
,
Dijana Dominis Prester
,
Marina Manganaro
ORCID logo ,
Daniel Mazin
,
Kari Nilsson
,
Mireia Nievas
,
Antonio Stamerra
,
Fabrizio Tavecchio
,
Ievgen Vovk
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.

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.

Keywords

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

Subject

Physical Sciences, Astronomy and Astrophysics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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