Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/109322
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Type: | Journal article |
Title: | Measurement of the EBL spectral energy distribution using the VHE γ-ray spectra of H.E.S.S. blazars |
Other Titles: | Measurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of H.E.S.S. blazars |
Author: | H.E.S.S. Collaboration, Abdalla, H. Abramowski, A. Aharonian, F. Ait Benkhali, F. Akhperjanian, A. Andersson, T. Angüner, E. Arakawa, M. Arrieta, M. Aubert, P. Backes, M. Balzer, A. Barnard, M. Becherini, Y. Tjus, J. Berge, D. Bernhard, S. Bernlöhr, K. Blackwell, R. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2017; 606:A59-1-A59-11 |
Publisher: | EDP Sciences |
Issue Date: | 2017 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | H. Abdalla ... R. Blackwell … P. de Witt … J. Hawkes … J. Lau … N. Maxted … G. Rowell … F. Voison ... et al. (The HESS Collaboration) |
Abstract: | Very 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. |
Keywords: | Gamma rays: galaxies; BL Lacertae objects: general; cosmic background radiation; infrared: diffuse background |
Rights: | © ESO, 2017 |
DOI: | 10.1051/0004-6361/201731200 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1051/0004-6361/201731200 |
Appears in Collections: | Aurora harvest 3 Physics publications |
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hdl_109322.pdf | Published version | 561.2 kB | Adobe PDF | View/Open |
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