Measurement of the EBL spectral energy distribution using the VHE γ-ray spectra of H.E.S.S. blazars

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dc.contributor.authorH.E.S.S. Collaboration,
dc.contributor.authorAbdalla, H.
dc.contributor.authorAbramowski, A.
dc.contributor.authorAharonian, F.
dc.contributor.authorAit Benkhali, F.
dc.contributor.authorAkhperjanian, A.
dc.contributor.authorAndersson, T.
dc.contributor.authorAngüner, E.
dc.contributor.authorArakawa, M.
dc.contributor.authorArrieta, M.
dc.contributor.authorAubert, P.
dc.contributor.authorBackes, M.
dc.contributor.authorBalzer, A.
dc.contributor.authorBarnard, M.
dc.contributor.authorBecherini, Y.
dc.contributor.authorTjus, J.
dc.contributor.authorBerge, D.
dc.contributor.authorBernhard, S.
dc.contributor.authorBernlöhr, K.
dc.contributor.authorBlackwell, R.
dc.contributor.authoret al.
dc.date.issued2017
dc.description.abstractVery high-energy γ rays (VHE, E ≳ 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 γ 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 9.5σ, and the intensity of the EBL obtained in different spectral bands is presented together with the associated γ-ray horizon.
dc.description.statementofresponsibilityH. Abdalla ... R. Blackwell … P. de Witt … J. Hawkes … J. Lau … N. Maxted … G. Rowell … F. Voison ... et al. (The HESS Collaboration)
dc.identifier.citationAstronomy and Astrophysics (A & A), 2017; 606:A59-1-A59-11
dc.identifier.doi10.1051/0004-6361/201731200
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.urihttp://hdl.handle.net/2440/109322
dc.language.isoen
dc.publisherEDP Sciences
dc.relation.grantARC
dc.rights© ESO, 2017
dc.source.urihttps://doi.org/10.1051/0004-6361/201731200
dc.subjectGamma rays: galaxies; BL Lacertae objects: general; cosmic background radiation; infrared: diffuse background
dc.titleMeasurement of the EBL spectral energy distribution using the VHE γ-ray spectra of H.E.S.S. blazars
dc.title.alternativeMeasurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of H.E.S.S. blazars
dc.typeJournal article
pubs.publication-statusPublished

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