Suzaku and Fermi view of the supernova remnant 3C 396

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2020-02-01
Sezer, A.
Ergin, Tülün
Cesur, N.
Tanaka, S. J.
Kisaka, S.
Mira, Y.
Yamazaki, R.
3C 396 is a composite supernova remnant (SNR), consisting of a central pulsar wind nebula (PWN) and a bright shell in the west, which is known to be interacting with molecular clouds (MCs). We present a study of X-ray emission from the shell and the PWN of the SNR 3C 396 using archival Suzaku data. The spectrum of the SNR shell is clearly thermal, without a signature of a non-thermal component. The abundances of Al and Ca from the shell are slightly enhanced, which indicates the presence of metal-enriched supernova ejecta. The PWN spectra are well described by a power-law model with a photon index of similar to 1.97 and a thermal component with an electron temperature of similar to 0.93 keV. The analysis of about 11 yr of Fermi data revealed an 18 sigma detection of gamma-ray emission from the location overlapping with the position of 3C 396 / 4FGL J1903.8+0531. The spectrum of 3C 396 / 4FGL J1903.8+0531 is best fitted with a log-parabola function with parameters of alpha = 2.66 and beta = 0.16 in the energy range of 0.2-300 GeV. The luminosity of 3C 396 / 4FGL J1903.8+0531 was found to be >10(35) erg s(-1) at 6.2 kpc, which rules out the inverse Compton emission model. Possible scenarios of gamma-ray emission are hadronic emission and bremsstrahlung processes, due to the fact that the SNR is expanding into dense MCs in the western and northern regions of the SNR.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

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Citation Formats
A. Sezer et al., “Suzaku and Fermi view of the supernova remnant 3C 396,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, pp. 1484–1491, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47029.