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001     408336
005     20211110151242.0
010 _ _ |a
020 _ _ |a 978-3-935702-83-6
024 7 _ |a 10.3204/DESY-PROC-2013-04/horns_dieter
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024 7 _ |a 1435-8077
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037 _ _ |a PUBDB-2018-02789
041 _ _ |a English
088 1 _ |a DESY-PROC-2013-04
088 _ _ |a DESY-PROC-2013-04
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100 1 _ |a Horns, D.
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|e Corresponding author
111 2 _ |a 9th Patras Workshop on Axions, WIMPs and WISPs
|c Mainz
|d 2013-06-24 - 2013-06-28
|g AXION-WIMP 2013
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|w Germany
245 _ _ |a Pair-production opacity at high and very-high gamma-ray energies
260 _ _ |a Hamburg
|c 2013
|b Verlag Deutsches Elektronen-Synchrotron
295 1 0 |a Horns, 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
300 _ _ |a 77-80
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490 0 _ |a DESY-PROC
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520 _ _ |a The 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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700 1 _ |a Meyer, M.
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787 0 _ |a Oberlack, Uwe et. al.
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|t Proceedings, 9th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2013)
856 4 _ |u https://bib-pubdb1.desy.de/record/408336/files/fulltext.pdf
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