Matches in SemOpenAlex for { <https://semopenalex.org/work/W2077772271> ?p ?o ?g. }
- W2077772271 endingPage "033" @default.
- W2077772271 startingPage "033" @default.
- W2077772271 abstract "In the recent years, the number of detected very high energy (VHE: E > 100 GeV) gamma-ray sources has increased rapidly. The sources have been observed at redshifts up to z = 0.536 without strong indications for the presence of absorption features in the energy spectra. Absorption is however expected due to pair-production processes of the propagating photons with the photon bath in intergalactic space. Even though this photon density is not well known, lower limits can be firmly set by the resolved emission from galaxy counts. Using this guaranteed background light, we investigate the behaviour of the energy spectra in the transition region from the optically thin to the optically thick regime. Among the sample of 50 energy spectra, 7 spectra cover the the range from optical depth τ < 1 to τ > 2. For these sources, the transition to τ > 2 takes place at widely different energies ranging from 0.4 TeV to 21 TeV. Consistently, in all of these sources, an upturn of the absorption-corrected spectrum is visible at this transition with a combined significance of 4.2 standard deviations. Given the broad range of energies and redshifts covered by the sample, source-intrinsic features are unlikely to explain the observed effect. Systematic effects related to observations have been investigated and found to be not sufficient to account for the observed effect. The pair-production process seems to be suppressed in a similar way as expected in the extension of the standard model by a light ( < neV) pseudoscalar (axion-like) particle." @default.
- W2077772271 created "2016-06-24" @default.
- W2077772271 creator A5022809978 @default.
- W2077772271 creator A5081384824 @default.
- W2077772271 date "2012-02-23" @default.
- W2077772271 modified "2023-10-13" @default.
- W2077772271 title "Indications for a pair-production anomaly from the propagation of VHE gamma-rays" @default.
- W2077772271 cites W1496927362 @default.
- W2077772271 cites W1687599274 @default.
- W2077772271 cites W1753661322 @default.
- W2077772271 cites W1967754444 @default.
- W2077772271 cites W1968556660 @default.
- W2077772271 cites W1976291162 @default.
- W2077772271 cites W1995305986 @default.
- W2077772271 cites W1997291893 @default.
- W2077772271 cites W1998087699 @default.
- W2077772271 cites W2005117828 @default.
- W2077772271 cites W2005425000 @default.
- W2077772271 cites W2009584320 @default.
- W2077772271 cites W2025053369 @default.
- W2077772271 cites W2042887613 @default.
- W2077772271 cites W2052978992 @default.
- W2077772271 cites W2064378914 @default.
- W2077772271 cites W2068305704 @default.
- W2077772271 cites W2068614195 @default.
- W2077772271 cites W2073974399 @default.
- W2077772271 cites W2075512945 @default.
- W2077772271 cites W2078673191 @default.
- W2077772271 cites W2085603035 @default.
- W2077772271 cites W2086247295 @default.
- W2077772271 cites W2096571362 @default.
- W2077772271 cites W2098597426 @default.
- W2077772271 cites W2099504389 @default.
- W2077772271 cites W2100086528 @default.
- W2077772271 cites W2102338692 @default.
- W2077772271 cites W2102751224 @default.
- W2077772271 cites W2102848968 @default.
- W2077772271 cites W2104402472 @default.
- W2077772271 cites W2106768815 @default.
- W2077772271 cites W2108388706 @default.
- W2077772271 cites W2110359358 @default.
- W2077772271 cites W2113535265 @default.
- W2077772271 cites W2115282064 @default.
- W2077772271 cites W2115618186 @default.
- W2077772271 cites W2117630964 @default.
- W2077772271 cites W2117727043 @default.
- W2077772271 cites W2123286793 @default.
- W2077772271 cites W2126113369 @default.
- W2077772271 cites W2126516256 @default.
- W2077772271 cites W2135101687 @default.
- W2077772271 cites W2140036978 @default.
- W2077772271 cites W2149001020 @default.
- W2077772271 cites W2149558418 @default.
- W2077772271 cites W2149990597 @default.
- W2077772271 cites W2155689241 @default.
- W2077772271 cites W2158252122 @default.
- W2077772271 cites W2164377755 @default.
- W2077772271 cites W2165813309 @default.
- W2077772271 cites W2166149816 @default.
- W2077772271 cites W2583679747 @default.
- W2077772271 cites W2603858778 @default.
- W2077772271 cites W3099949665 @default.
- W2077772271 cites W3100120673 @default.
- W2077772271 cites W3103016641 @default.
- W2077772271 cites W3103319859 @default.
- W2077772271 cites W3103536960 @default.
- W2077772271 cites W3103570589 @default.
- W2077772271 cites W3124767513 @default.
- W2077772271 cites W4211058208 @default.
- W2077772271 cites W4302196431 @default.
- W2077772271 cites W573990488 @default.
- W2077772271 doi "https://doi.org/10.1088/1475-7516/2012/02/033" @default.
- W2077772271 hasPublicationYear "2012" @default.
- W2077772271 type Work @default.
- W2077772271 sameAs 2077772271 @default.
- W2077772271 citedByCount "128" @default.
- W2077772271 countsByYear W20777722712012 @default.
- W2077772271 countsByYear W20777722712013 @default.
- W2077772271 countsByYear W20777722712014 @default.
- W2077772271 countsByYear W20777722712015 @default.
- W2077772271 countsByYear W20777722712016 @default.
- W2077772271 countsByYear W20777722712017 @default.
- W2077772271 countsByYear W20777722712018 @default.
- W2077772271 countsByYear W20777722712019 @default.
- W2077772271 countsByYear W20777722712020 @default.
- W2077772271 countsByYear W20777722712021 @default.
- W2077772271 countsByYear W20777722712022 @default.
- W2077772271 countsByYear W20777722712023 @default.
- W2077772271 crossrefType "journal-article" @default.
- W2077772271 hasAuthorship W2077772271A5022809978 @default.
- W2077772271 hasAuthorship W2077772271A5081384824 @default.
- W2077772271 hasBestOaLocation W20777722712 @default.
- W2077772271 hasConcept C101583263 @default.
- W2077772271 hasConcept C120665830 @default.
- W2077772271 hasConcept C121332964 @default.
- W2077772271 hasConcept C125287762 @default.
- W2077772271 hasConcept C1276947 @default.
- W2077772271 hasConcept C159317903 @default.