X-Ray Spectrum of Sagittarius A East
X-Ray Spectrum of Sagittarius A East
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DOI：
10.1093/pasj/59.sp1.s237
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发表时间：
2007-01
影响因子：
2.3
通讯作者：
K. Koyama;H. Uchiyama;Y. Hyodo;H. Matsumoto;T. Tsuru;M. Ozaki;Y. Maeda;H. Murakami
中科院分区：
文献类型：
--
作者：
K. Koyama;H. Uchiyama;Y. Hyodo;H. Matsumoto;T. Tsuru;M. Ozaki;Y. Maeda;H. Murakami
Sgr A East是一个位于银河系中心（GC）区域的年轻SNR。由于GC区域被具有强6.7keV线的扩散X射线发射（GCDX）占据，因此GCDX的估计对于研究Sgr A East的X射线谱至关重要。GCDX的通量和光谱被发现是平滑地分布在Sgr A East周围和横跨Sgr A East，因此可以进行可靠的GCDX扣除。本文介绍了用朱雀星上的XIS测量的Sgr A East的X射线谱。除了先前报道的来自S XV、A rXVII、Ca XIX和Fe XXV（均为类He原子）的Kα线外，我们还发现了来自S XVI、A rXVIII、Fe eXXVI（均为类氢原子）和Ni XXVII（均为类He原子）的Kα线，来自S XV、A rXVII和Fe XXV的Kβ线，以及来自Fe XXV的aK γ线。使用这些线的等离子体诊断揭示了至少两个温度等离子体的存在。整个光谱可以用电离平衡的双温（1.2keV和1.6keV）等离子体加上幂律分量来拟合。
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 XV ,A rXVII, Ca XIX ,a nd FeXXV (all He-like atoms), we found Kα lines from S XVI ,A rXVIII ,F eXXVI (all hydrogenic atoms), and Ni XXVII (He-like), Kβ lines from S XV ,A rXVII ,a nd FeXXV ,a nd aK γ line from Fe XXV. 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 (∼ 1.2keV and ∼ 6keV) plasma in ionization equilibrium plus a power-law component.