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000408336 0247_ $$2datacite_doi$$a10.3204/DESY-PROC-2013-04/horns_dieter
000408336 0247_ $$2ISSN$$a1435-8077
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000408336 0881_ $$aDESY-PROC-2013-04
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000408336 1001_ $$0P:(DE-HGF)0$$aHorns, D.$$b0$$eCorresponding author
000408336 1112_ $$0C13-06-24.5$$2inspire$$a9th Patras Workshop on Axions, WIMPs and WISPs$$cMainz$$d2013-06-24 - 2013-06-28$$gAXION-WIMP 2013$$wGermany
000408336 245__ $$aPair-production opacity at high and very-high gamma-ray energies
000408336 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron$$c2013
000408336 29510 $$aHorns, D. "Pair-production opacity at high and very-high gamma-ray energies" in Proceedings, 9th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2013) / Oberlack, Uwe, Sissol, Pierre (eds.), 2013 ; AXION-WIMP 2013 : 9th Patras Workshop on Axions, WIMPs and WISPs , 2013-06-23 - 2013-06-28, Mainz
000408336 300__ $$a77-80
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000408336 520__ $$aThe propagation of high energy (HE,E$_γ >$ 100 MeV) and very high-energy gammarays (VHE, E$_γ >$ 100 GeV) in the extra-galactic photon field leads to pair- production and consequently energy-and distance-dependent attenuation of the primary intensity. The spectroscopy of an increasing number of extra-galactic objects at HE and VHE energies has demonstrated indeed the presence of such an attenuation which in turn has been used to constrain the photon density in the medium. At large optical depth $(\tau\gtrsim 2)$ potential modifications of pair-production due to competing but rare processes (as, e.g., the presence of sub-neV axion- like particle) may be found. Indications for a pair-production anomaly have previously been found with VHE-spectra. Here, we present further indications (at the level of 3.68 $σ$) for a reduced optical depth at high energies from an analysis of Fermi-LAT data.
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000408336 7001_ $$0P:(DE-HGF)0$$aMeyer, M.$$b1
000408336 7870_ $$0PUBDB-2015-05816$$aOberlack, Uwe et. al.$$iisPartOf$$rDESY-PROC-2013-04$$tProceedings, 9th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2013)
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