2007PASJ...59S.237K

Sgr A East is a young SNR located in the Galactic Center (GC) region. Since the GC region is occupied by diffuse X-ray emission (GCDX) with a strong 6.7keV line, an estimation of the GCDX is crucial to study the X-ray spectrum of Sgr A East. The flux and spectrum of the GCDX are found to be smoothly distributed around and across Sgr A East, and hence a reliable GCDX subtraction can be made. This paper presents the X-ray spectrum of Sgr A East with the XIS on board Suzaku. In addition to the previously reported Kα lines from S <FONT SIZE="-2">XV</FONT>, Ar <FONT SIZE="-2">XVII</FONT>, Ca <FONT SIZE="-2">XIX</FONT>, and Fe <FONT SIZE="-2">XXV</FONT> (all He-like atoms), we found Kα lines from S <FONT SIZE="-2">XVI</FONT>, Ar <FONT SIZE="-2">XVIII</FONT>, Fe <FONT SIZE="-2">XXVI</FONT> (all hydrogenic atoms), and Ni <FONT SIZE="-2">XXVII</FONT> (He-like), Kb lines from S <FONT SIZE="-2">XV</FONT>, Ar <FONT SIZE="-2">XVII</FONT>, and Fe <FONT SIZE="-2">XXV</FONT>, and a Kg line from Fe <FONT SIZE="-2">XXV</FONT>. Plasma diagnostics using these lines revealed the presence of at least a two-temperature plasma. The overall spectrum can be fitted with a two-temperature (∼1.2 keV and ∼ 6 keV) plasma in ionization equilibrium plus a power-law component.