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Quasars at all cosmic epochs

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Front. Astron. Space Sci. | doi: 10.3389/fspas.2017.00050

Probing the diffuse optical-IR background with TeV blazars detected with the MAGIC Telescopes

 Elisa Prandini1*, Alberto Dominguez2,  Vandad Fallah Ramazani3, Tarek Hassan4,  Daniel Mazin5, 6,  Abelardo Moralejo4,  Mireia Nievas Rosillo2, Gaia Vanzo7, 8 and Monica Vazquez Acosta7, 8
  • 1Università degli Studi di Padova, Italy
  • 2Complutense University of Madrid, Spain
  • 3University of Turku, Finland
  • 4Institute for High Energy Physics, Spain
  • 5Max Planck Institute for Physics (MPG), Germany
  • 6Institute for Cosmic Ray Research, University of Tokyo, Japan
  • 7Instituto de Astrofísica de Canarias, Spain
  • 8Universidad de La Laguna, Spain

Blazars are radio loud quasars whose jet points toward the observer. The observed emission is mostly non-thermal, dominated by the jet emission, and in some cases extends up to the very high energy gamma rays (VHE; E $>$ 100 GeV). To date, more than 60 blazars have been detected at VHE mainly with ground-based imaging atmospheric Cherenkov telescopes (IACTs) such as MAGIC, H.E.S.S. and VERITAS. Energetic photons from a blazar may interact with the diffuse optical and IR background (the extragalactic background light, EBL) leaving an imprint on the blazar energy spectrum. This effect can be used to constrain the EBL, with basic assumptions on the intrinsic energy spectrum. Current generation of IACTs is providing valuable measurements of the EBL density and energy spectrum from optical to infrared frequencies.
In this contribution, we present the latest results obtained with the data taken with the MAGIC telescopes: using 32 spectra from 12 blazars, the scale factor of the optical density predicted by the EBL model from Dom\'{\i}nguez et al. (2011) is constrained to be 0.95 (+0.11, -0.12)$_{stat}$ (+0.16, -0.07)$_{sys}$, where a value of 1 means the perfect match with the model.

Keywords: Active Galactic Nuclei (AGN), Blazars, Extragalactic Background Light (EBL), Relativistic jets, MAGIC telescopes, Gamma Rays

Received: 22 Sep 2017; Accepted: 07 Nov 2017.

Edited by:

Ascensión Del Olmo, Instituto de Astrofísica de Andalucía (CSIC), Spain

Reviewed by:

Daniela Bettoni, Osservatorio Astronomico di Padova (INAF), Italy
Milan S. Dimitrijevic, Astronomical Observatory, Serbia  

Copyright: © 2017 Prandini, Dominguez, Fallah Ramazani, Hassan, Mazin, Moralejo, Nievas Rosillo, Vanzo and Vazquez Acosta. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: PhD. Elisa Prandini, Università degli Studi di Padova, Padua, Italy,