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- W3123852395 abstract "Analysis of gamma-ray emission from the supernova remnant G78.2+2.1 ($gamma$ Cygni) with 7.2 years of cumulative data from the Fermi-LAT telescope shows a distinct hard, bright and extended component to the north of the shell coincident with the known TeV source VER J2019+407. In the GeV-TeV energy range its spectrum is best described by a broken power-law with indices 1.8 below a break energy of 71 GeV and 2.5 above the break. A broadband spectral energy distribution is assembled and different scenarios for the origin of the gamma-rays are explored. Both hadronic and leptonic mechanisms are able to account for the GeV-TeV observations. In the leptonic framework, a superposition of inverse Compton and nonthermal bremsstrahlung emissions is needed whereas the hadronic scenario requires a cosmic ray population described by a broken power-law distribution with a relatively hard spectral index of $sim1.8$ below a break particle energy of 0.45 TeV. In addition, the neutrino flux expected from cosmic ray interactions is calculated." @default.
- W3123852395 created "2021-02-01" @default.
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- W3123852395 date "2016-07-18" @default.
- W3123852395 modified "2023-10-02" @default.
- W3123852395 title "THE GIGAELECTRONVOLT COUNTERPART OF VER J2019+407 IN THE NORTHERN SHELL OF THE SUPERNOVA REMNANT G78.2+2.1 (<i>γ</i>Cygni)" @default.
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- W3123852395 doi "https://doi.org/10.3847/0004-637x/826/1/31" @default.
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