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Article overview
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The GeV counterpart of VER J2019+407 in the northern shell of the supernova remnant G78.2+2.1 ($gamma$ Cygni) | | Nissim Fraija
; Miguel Araya
; | | Date: |
2 May 2016 | | 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. | | Source: | arXiv, 1605.0571 | | Services: | Forum | Review | PDF | Favorites | |
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