• Login
    View Item 
    •   NWU-IR Home
    • Research Output
    • Faculty of Natural and Agricultural Sciences
    • View Item
    •   NWU-IR Home
    • Research Output
    • Faculty of Natural and Agricultural Sciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S.

    Thumbnail
    View/Open
    2013Measurement.pdf (559.0Kb)
    Date
    2013
    Author
    Abramowski, A.
    Casanova, S.
    Pekeur, N.W.
    Sheidaei, F.
    Venter, C.
    Vorster, M.
    Metadata
    Show full item record
    Abstract
    The 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.
    URI
    http://hdl.handle.net/10394/13603
    http://dx.doi.org/10.1051/0004-6361/201220355
    Collections
    • Faculty of Natural and Agricultural Sciences [3813]

    Copyright © North-West University
    Contact Us | Send Feedback
    Theme by 
    @mire NV
     

     

    Browse

    All of NWU-IR Communities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Copyright © North-West University
    Contact Us | Send Feedback
    Theme by 
    @mire NV