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005     20211110133446.0
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100 1 _ |a Meyer, Manuel
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111 2 _ |a 7th Patras Workshop on Axions, WIMPs and WISPs
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|d 2011-06-27 - 2011-07-01
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245 _ _ |a Indications for a suppression of pair production at very high energies
260 _ _ |c 2011
|b Deutsches Elektronen-Synchrotron, DESY
|a Hamburg
300 _ _ |a 151-157
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520 _ _ |a The transparency of the universe for very high energy (VHE) photons is limited due to pair-production with low energy photons of the extra galactic background light (EBL) in the ultra-violet to infrared wavelength band. Here, we use 58 energy spectra from VHE emitting active galactic nuclei (AGN) from redshift 0.004 to 0.536 to search for signatures of deviations from the minimum expected opacity. A statistical study of the individual measurements reveals indications for an overcorrection of AGN spectra with current EBL models. Axion like particles are discussed as a possible explanation of the result.
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700 1 _ |a Horns, Dieter
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773 _ _ |a 10.3204/DESY-PROC-2011-04/meyer_manuel
787 0 _ |a Schumann, Marc et.al.
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|t Proceedings, 7th Patras Workshop on Axions, WIMPs and WISPs
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