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The supernova remnant Kes 73 and/or the magnetar 1E 1841-045 at its centercan deposit a large amount of energy to the surroundings and is potentiallyresponsible for particle acceleration. Using the data taken with the FermiLarge Area Telescope (LAT), we confirmed the presence of an extended sourcewhose centroid position is highly consistent with thismagnetar/supernova-remnant pair. Its emission is intense from 100 MeV to $>$100GeV. Its LAT spectrum can be decoupled into two components which arerespectively governed by two different mechanisms. According to the young ageof this system, the magnetar is seemingly a necessary and sufficient source forthe downward-curved spectrum below 10 GeV, as the observed $<$10 GeV flux istoo high for the supernova remnant to account for. On the other hand, thesupernova remnant is reasonably responsible for the hard spectrum above 10 GeV.Further studies of this region in the TeV regime is required, so that we canperform physically meaningful comparisons of the $>$10 GeV spectrum and the TeVspectrum.

Gamma-ray Emission of the Kes 73/1E 1841-045 Region Observed with the Fermi Large Area Telescope