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Measurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of HESS blazars
North-West University, South Africa.
University of Hamburg, Germany.
Max Planck Institute for Nuclear Physics, Germany ; Dublin Institute for Advanced Studies, Ireland ; National Academy ofSciences of the Republic of Armenia, Armenia.
Max Planck Institute for Nuclear Physics, Germany.
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2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 606, article id A59Article in journal (Refereed) Published
Abstract [en]

Very high-energy gamma rays (VHE, E greater than or similar to 100 GeV) propagating over cosmological distances can interact with the low-energy photons of the extragalactic background light (EBL) and produce electron-positron pairs. The transparency of the Universe to VHE gamma rays is then directly related to the spectral energy distribution (SED) of the EBL. The observation of features in the VHE energy spectra of extragalactic sources allows the EBL to be measured, which otherwise is very difficult. An EBL model-independent measurement of the EBL SED with the H.E.S.S. array of Cherenkov telescopes is presented. It was obtained by extracting the EBL absorption signal from the reanalysis of high-quality spectra of blazars. From H.E.S.S. data alone the EBL signature is detected at a significance of 9.5 sigma, and the intensity of the EBL obtained in different spectral bands is presented together with the associated gamma-ray horizon.

Place, publisher, year, edition, pages
2017. Vol. 606, article id A59
Keywords [en]
gamma rays: galaxies, BL Lacertae objects: general, cosmic background radiation, infrared: diffuse background
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-68505DOI: 10.1051/0004-6361/201731200ISI: 000412876700003OAI: oai:DiVA.org:lnu-68505DiVA, id: diva2:1153968
Available from: 2017-11-01 Created: 2017-11-01 Last updated: 2018-08-30Bibliographically approved

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Becherini, YvonneFarnier, ChristianProkhorov, DmitryPunch, Michael

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Becherini, YvonneFarnier, ChristianProkhorov, DmitryPunch, Michael
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Department of Physics and Electrical Engineering
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