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Measurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of HESS blazars

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journal contribution
posted on 15.03.2018, 15:04 by H Abdalla, A Abramowski, F Aharonian, F. A. Benkhali, A. G. Akhperjanian, T Andersson, E. O. Anguner, M Arakawa, M Arrieta, P Aubert, M Backes, A Balzer, M Barnard, Y Becherini, J. B. Tjus, D Berge, S Bernhard, K Bernloehr, R Blackwell, M Bottcher, C Boisson, J Bolmont, S Bonnefoy, P Bordas, J Bregeon, F Brun, P Brun, M Bryan, M Buechele, T Bulik, M Capasso, J Carr, S Casanova, M Cerruti, N Chakraborty, R. C. G. Chaves, A Chen, J Chevalier, M Coffaro, S Colafrancesco, G Cologna, B Condon, J Conrad, Y Cui, I. D. Davids, J Decock, B Degrange, C Deil, J Devin, P de Wilt, L Dirson, A Djannati-Atai, W Domainko, A Donath, L. O. Drury, K Dutson, J Dyks, T Edwards, K Egberts, P Eger, J. -P. Ernenwein, S Eschbach, C Farnier, S Fegan, M. V. Fernandes, A Fiasson, G Fontaine, A Foerster, S Funk, M Fuessling, S Gabici, Y. A. Gallant, T Garrigoux, G Giavitto, B Giebels, J. F. Glicenstein, D Gottschall, A Goyal, M. -H. Grondin, J Hahn, M Haupt, J Hawkes, G Heinzelmann, G Henri, G Hermann, J. A. Hinton, W Hofmann, C Hoischen, T. L. Holch, M Holler, D Horns, A Ivascenko, H Iwasaki, A Jacholkowska, M Jamrozy, M Janiak, D Jankowsky, F Jankowsky, M Jingo, T Jogler, L Jouvin, I Jung-Richardt, MA Kastendieck, K Katarzynski, M Katsuragawa, U Katz, D Kerszberg, D Khangulyan, B Khelifi, J King, S Klepser, D Klochkov, W Kluzniak, D Kolitzus, N Komin, K Kosack, S Krakau, M Kraus, P. P. Kruger, H Laffon, G Lamanna, J Lau, J. -P. Lees, J Lefaucheur, V Lefranc, A Lemiere, M Lemoine-Goumard, J. -P. Lenain, E Leser, T Lohse, M Lorentz, R Liu, R Lopez-Coto, I Lypova, V Marandon, A Marcowith, C Mariaud, R Marx, G Maurin, N Maxted, M Mayer, P. J. Meintjes, M Meyer, A. M. W. Mitchell, R Moderski, M Mohamed, L Mohrmann, K Mora, E Moulin, T Murach, S Nakashima, M de Naurois, F Niederwanger, J Niemiec, L Oakes, P O'Brien, H Odaka, S Ohm, M Ostrowski, I Oya, M Padovani, M Panter, R. D. Parsons, N. W. Pekeur, G Pelletier, C Perennes, P-O Petrucci, B Peyaud, Q Piel, S Pita, H Poon, D Prokhorov, H Prokoph, G Puehlhofer, M Punch, A Quirrenbach, S Raab, R Rauth, A Reimer, O Reimer, M Renaud, R de los Reyes, S Richter, F Rieger, C Romoli, G Rowell, B Rudak, C. B. Rulten, V Sahakian, S Saito, D Salek, D. A. Sanchez, A Santangelo, M Sasaki, R Schlickeiser, F Schussler, A Schulz, U Schwanke, S Schwemmer, M Seglar-Arroyo, M Settimo, A. S. Seyffert, N Shafi, I Shilon, R Simoni, H Sol, F Spanier, G Spengler, F Spies, L Stawarz, R Steenkamp, C Stegmann, K Stycz, I Sushch, T Takahashi, J. -P. Tavernet, T Tavernier, A. M. Taylor, R Terrier, L Tibaldo, D Tiziani, M Tluczykont, C Trichard, N Tsuji, R Tuffs, Y Uchiyama, D. J. van der Walt, C van Eldik, C van Rensburg, B van Soelen, G Vasileiadis, J Veh, C Venter, A Viana, P Vincent, J Vink, F Voisin, HJ Voelk, T Vuillaume, Z Wadiasingh, S. J. Wagner, P Wagner, RM Wagner, R White, A Wierzcholska, P Willmann, A Woernlein, D Wouters, R Yang, D Zaborov, M Zacharias, R Zanin, A. A. Zdziarski, A Zech, F Zefi, A Ziegler, N Zywucka
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 to determine. An EBL-model independent measurement of the EBL SED with the H.E.S.S. array of Cherenkov telescopes is presented. It is 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

History

Citation

Astronomy and Astrophysics, 2017, 606, A59, p 11

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Astronomy and Astrophysics

Publisher

EDP Sciences

issn

0004-6361

eissn

1432-0746

Copyright date

2017

Available date

15/03/2018

Publisher version

https://www.aanda.org/articles/aa/abs/2017/10/aa31200-17/aa31200-17.html

Language

en