Initial state of the recombining plasma in supernova remnant W 28

Abstract

We investigate an SNR W28 with the Suzaku archive data and report the results of spatial resolved analyses. We carry out spectral analysis using a recombining plasma (RP) model with an element-dependent initial ionization temperature, and obtain the ionization temperatures to be $\sim 0.5$~keV for Ne, $\sim 0.7$~keV for Mg, $\sim 1.0$~keV for Si, $\sim 1.2$~keV for S, $\sim 1.4$~keV for Ar, $\sim 1.7$~keV for Ca, and $\sim 0.7$~keV for Fe in the RP-initial phase. In addition to northeast regions where RP have been reported, we find that the ionization temperature in the southeast and southwest regions show a similar trend to the central region, in the RP-initial phase. Furthermore, the elapsed time from the RP-initial phase to present is shorter, $\sim 300$~yr in the central region and longer, $\sim 10^3$-$10^4$~yr in the outside regions. Our results cannot be explained by simple scenarios of thermal conduction due to molecular clouds or adiabatic cooling (rarefaction), and indicate that more complex mechanism or other scenarios are required. Also, we estimate the ejecta mass $\gtrsim 14M_{\odot }$, which indicates a SNR derived a massive star.

arXiv comment11 pages, 5 figures. Published in PASJ

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Cited by in corpus (1)

• A Complete X-ray View of Supernova Remnant W28 with Einstein Probe: Spatial Distribution of Parameters and Origin of the Thermal-Composite Morphology