New identification of the mixed-morphology supernova remnant G298.6−0.0 with possible gamma-ray association

Aya Bamba, Makoto Sawada, Yuto Nakano, Yukikatsu Terada, John Hewitt, Robert Petre, Lorella Angelini
2015 Nippon Tenmon Gakkai obun kenkyu hokoku  
We present an X-ray analysis on the Galactic supernova remnant (SNR) G298.6-0.0 with Suzaku. The X-ray image shows a center-filled structure inside the radio shell, implying this SNR is categorized as a mixed-morphology (MM) SNR. The spectrum is well reproduced by a single temperature plasma model in ionization equilibrium, with a temperature of 0.78 (0.70-0.87) keV. The total plasma mass of 30 solar mass indicates that the plasma has interstellar medium origin. The association with a GeV
more » ... on with a GeV gamma-ray source 3FGL J1214.0-6236 on the shell of the SNR is discussed, in comparison with other MM SNRs with GeV gamma-ray associations. It is found that the flux ratio between absorption-corrected thermal X-rays and GeV gamma-rays decreases as the MM SNRs evolve to larger physical sizes. The absorption-corrected X-ray flux of G298.6-0.0 and the GeV gamma-ray flux of 3FGL J1214.0-6236 closely follow this trend, implying that 3FGL J1214.0-6236 is likely to be the GeV counterpart of G298.6-0.0.
doi:10.1093/pasj/psv096 fatcat:gjlvu3t4xzhh5jm62o2u6bfybu