Studying the Supernova Remnant G31.9+0.0 in Gamma and X-Rays

G31.9+0.0 (3C 391) is a Galactic mixed-morphology supernova remnant observed in GeV gamma rays by Fermi Gamma Ray Space Telescope's LAT (Fermi-LAT), as well as in the 0.3 10 keV X-ray band by Suzaku. In this paper, we will present the analysis results of X- and gamma-ray data of 3C 391 taken with Suzaku and Fermi-LAT. The X-ray spectrum of 3C 391 was fitted to a single-temperature variable abundance non-equilibrium ionization (VNEI) model with an electron temperature of kTe 0.57 keV, an absorbing column density of NH 3.1 10 22 cm 2 and a very high ionization age (t > 10 12 cm 3 s), which suggest that the plasma has reached ionization equilibrium. The spectrum is characterized by clearly detected emission lines of Mg, Si, and S. 3C 391 was detected in GeV gamma rays with a significance of 13 s . The spectrum was fitted with a log-parabola function, where the spectral index and beta parameters were found to be a = 2.35 0.07 and b = 0.366 0.339. The integrated flux above 200 MeV was found as F = (1.36 0.62) 10 8 ph cm 2 s 1 . These results are in agreement with the Fermi-LAT results given in the 2nd Fermi-LAT catalog.