TY - JOUR
T1 - Fermi large area telescope detection of a break in the gamma-ray spectrum of the supernova remnant cassiopeia a
AU - Yuan, Yajie
AU - Funk, Stefan
AU - Jóhannesson, Gülauger
AU - Lande, Joshua
AU - Tibaldo, Luigi
AU - Uchiyama, Yasunobu
PY - 2013/12/20
Y1 - 2013/12/20
N2 - We report on observations of the supernova remnant Cassiopeia A in the energy range from 100 MeV to 100 GeV using 44 months of observations from the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We perform a detailed spectral analysis of this source and report on a low-energy break in the spectrum at 1.72+1.35-0.89GeV. By comparing the results with models for the gamma-ray emission, we find that hadronic emission is preferred for the GeV energy range.
AB - We report on observations of the supernova remnant Cassiopeia A in the energy range from 100 MeV to 100 GeV using 44 months of observations from the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We perform a detailed spectral analysis of this source and report on a low-energy break in the spectrum at 1.72+1.35-0.89GeV. By comparing the results with models for the gamma-ray emission, we find that hadronic emission is preferred for the GeV energy range.
KW - acceleration of particles
KW - gamma rays: general
KW - ISM: supernova remnants
KW - radiation mechanisms: non-thermal
KW - supernovae: individual (Cassiopeia A)
UR - https://www.scopus.com/pages/publications/84890089350
U2 - 10.1088/0004-637X/779/2/117
DO - 10.1088/0004-637X/779/2/117
M3 - Article
AN - SCOPUS:84890089350
SN - 0004-637X
VL - 779
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 117
ER -