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Kes 69 is a mixed-morphology (MM) supernova remnant (SNR) that is known to beinteracting with molecular clouds based on 1720 MHz hydroxyl (OH) maseremission observations in the northeastern and southeastern regions. We presentan investigation of Kes 69 using $\sim$67 ks Suzaku observation. The X-rayspectrum of the whole SNR is well fitted by a non-equilibrium ionization modelwith an electron temperature of $kT_{\rm e}$ $\sim$ 2.5 keV, ionizationtime-scale of $\tau$ $\sim$ 4.1$\times10^{10}$ cm$^{-3}$ s and absorbing columndensity of $N_{\rm H}$ $\sim$ 3.1$\times10^{22}$ cm$^{-2}$. We clearly detectedthe Fe-K$\alpha$ line at $\sim$6.5 keV in the spectra. The plasma showsslightly enhanced abundances of Mg, Si, S and Fe indicating that the plasma islikely to be of ejecta origin. We find no significant feature of a recombiningplasma in this SNR. In order to characterize radial variations in the X-rayspectral parameters, we also analyze annular regions in the remnant. Weinvestigate the explosive origin of Kes 69 and favor the core-collapse origin.Additionally, we report a lack of significant gamma-ray emission from Kes 69,after analyzing the GeV gamma-ray data taken for about 9 years by the LargeArea Telescope on board Fermi. Finally, we discuss the properties of Kes 69 inthe context of other interacting MM SNRs.

A Suzaku X-ray study of the mixed-morphology supernova remnant Kes 69 and searching for its gamma-ray counterpart