{\it Suzaku} observation of Galactic supernova remnant CTB 37A (G348.5+0.1)

Abstract

We present here the results of the observation of CTB 37A obtained with the X-ray Imaging Spectrometer onboard the {\it Suzaku} satellite. The X-ray spectrum of CTB 37A is well fitted by two components, a single-temperature ionization equilibrium component (VMEKAL) with solar abundances, an electron temperature of $k{T}_{\mathrm{e}}\sim 0.6$ keV, absorbing column density of $N_{\mathrm{H}}\sim 3\times 10^{22}$ $\mathrm{c}{\mathrm{m}}^{-2}$ and a power-law component with photon index of $\Gamma$ $\sim 1.6$. The X-ray spectrum of CTB 37A is characterized by clearly detected K-shell emission lines of Mg, Si, S, and Ar. The plasma with solar abundances supports the idea that the X-ray emission originates from the shocked interstellar material. The ambient gas density, and age of the remnant are estimated to be $\sim 1f^{-1/2}$$\mathrm{c}{\mathrm{m}}^{-3}$ and $\sim 3\times 10^4{f}^{1/2}$ yr, respectively. The center-filling X-ray emission surrounded by a shell-like radio structure and other X-ray properties indicate that this remnant would be a new member of mixed-morphology supernova remnant class.

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