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dc.contributor.authorAbramowski, A.
dc.contributor.authorCasanova, S.
dc.contributor.authorPekeur, N.W.
dc.contributor.authorSheidaei, F.
dc.contributor.authorVenter, C.
dc.contributor.authorVorster, M.
dc.date.accessioned2015-03-23T09:05:14Z
dc.date.available2015-03-23T09:05:14Z
dc.date.issued2013
dc.identifier.citationAbramowski, A. et al. 2013. Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S. Astronomy & astrophysics, 550(A4):1-11. [http://www.aanda.org/]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/13603
dc.identifier.urihttp://dx.doi.org/10.1051/0004-6361/201220355
dc.description.abstractThe extragalactic background light (EBL) is the diffuse radiation with the second highest energy density in the Universe after the cosmic microwave background. The aim of this study is the measurement of the imprint of the EBL opacity to γ-rays on the spectra of the brightest extragalactic sources detected with the High Energy Stereoscopic System (H.E.S.S.). The originality of the method lies in the joint fit of the EBL optical depth and of the intrinsic spectra of the sources, assuming intrinsic smoothness. Analysis of a total of ∼105 γ-ray events enables the detection of an EBL signature at the 8.8σ level and constitutes the first measurement of the EBL optical depth using very-high energy (E > 100 GeV) γ-rays. The EBL flux density is constrained over almost two decades of wavelengths [0.30 μm, 17 μm] and the peak value at 1.4 μm is derived as λFλ = 15 ± 2stat ± 3sys nW m−2 sr−1.en_US
dc.language.isoenen_US
dc.publisherEDP Sciencesen_US
dc.subjectGamma rays: galaxiesen_US
dc.subjectcosmic background radiationen_US
dc.subjectBL Lacertae objects: generalen_US
dc.titleMeasurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S.en_US
dc.typeArticleen_US
dc.contributor.researchID22050574 - Pekeur, Nicolette Whilna
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID23909196 - Casanova, Sabrina
dc.contributor.researchID22164405 - Sheidaei, Farzaneh
dc.contributor.researchID12792322 - Vorster, Michael Johannes


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