A1 Refereed original research article in a scientific journal
Probing the Diffuse Optical-IR Background with TeV Blazars Detected with the MAGIC Telescopes
Authors: Elisa Prandini, Alberto Domínguez, Vandad Fallah Ramazani, Tarek Hassan, Daniel Mazin, Abelardo Moralejo, Mireia Nievas Rosillo, Gaia Vanzo, Monica Vazquez Acosta
Publisher: FRONTIERS MEDIA SA
Publication year: 2017
Journal:Frontiers in Astronomy and Space Sciences
Journal name in sourceFRONTIERS IN ASTRONOMY AND SPACE SCIENCES
Journal acronym: FRONT ASTRON SPACE
Article number: UNSP 50
Volume: 4
Issue: 50
Number of pages: 5
ISSN: 2296-987X
eISSN: 2296-987X
DOI: https://doi.org/10.3389/fspas.2017.00050
Web address : https://www.frontiersin.org/articles/10.3389/fspas.2017.00050/full
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/31738017
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 spectrumfromoptical 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 Dominguez 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.
Downloadable publication This is an electronic reprint of the original article. |  |
