Suzaku Observations of Ejecta-Dominated Galactic Supernova Remnant G346.6-0.2

Abstract

We present here the results of the X-ray analysis of Galactic supernova remnant G346.6-0.2 observed with {\it Suzaku}. K-shell emission lines of Mg, Si, S, Ca and Fe are detected clearly for the first time. Strong emission lines of Si and S imply that X-ray emission nature of G346.6-0.2 is ejecta-dominated. The ejecta-dominated emission is well fitted with a combined model consisting of thermal plasma in non-equilibrium ionization and a non-thermal component, which can be regarded as synchrotron emission with a photon index of $\Gamma$ $\sim 0.6$. Absorbing column density of $N_{\mathrm{H}}\sim 2.1\times 10^{22}$ $\mathrm{c}{\mathrm{m}}^{-2}$ is obtained from the best-fitting implying a high-density medium, high electron temperature of $k{T}_{\mathrm{e}}\sim 1.2$ keV, and ionization timescale of $n_{\mathrm{e}}t\sim 2.9\times 10^{11}$ $\mathrm{c}{\mathrm{m}}^{-3}\mathrm{s}$ indicating that this remnant may be far from full ionization equilibrium. The relative abundances from the ejecta show that the remnant originates from a Type Ia supernova explosion.

7 pages, 4 figure

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