银河系中心的超级气泡候选者和局部增强G359 .77-0.09
A Super Bubble Candidate in the Galactic Center and a Local Enhancement G359.77-0.09
摘要：
在类氦硫的K $α$线的窄能带中，在银河系中心附近发现了一个20' \times 16'椭圆环状结构。在环中，发现了两个弥散源，一个超新星遗迹候选者G359.79-0.26和一个身份不明的源G359.77-0.09。G359.77-0.09的X射线谱与G359.79-0.26的X射线谱相似，这可以用0.7和1.0 keV的吸收薄热等离子体模型来解释。这两个源的吸收柱密度都很大（N_H = 6.9 \times 10^{22}和4.5 \times 10^{22} cm^{-2}），并且与银河系中心距离的密度一致。从环状结构中提取的X射线谱也由吸收薄热等离子体模型（kT_e \sim 0.9 keV）表示。填充环状结构的等离子体的热能估计为1.0 \times 10^{51} erg。因此，我们提出，这两个来源包括一个单一的环状物体，这可能是一个超级泡沫的大小为49 pc \times 40 pc的银河系中心区域。
英文摘要：
A 20' \times 16' elliptical ring-like structure has been found near the Galactic center in the narrow energy band corresponding to the K$α$ line from He-like sulfur. In the ring, two diffuse sources are found, a supernova remnant candidate G359.79-0.26 and an unidentified source G359.77-0.09. The X-ray spectrum of G359.77-0.09 is similar to that of G359.79-0.26, which can be explained by an absorbed thin thermal plasma model with temperatures of 0.7 and 1.0 keV. The absorption column densities of these two sources are large (N_H = 6.9 \times 10^{22} and 4.5 \times 10^{22} cm^{-2}) and are consistent with that of the Galactic center distance. The X-ray spectrum extracted from the ring-like structure is also represented by an absorbed thin thermal plasma model (kT_e \sim 0.9 keV). The thermal energy of the plasma filling the ring-like structure is estimated to be 1.0 \times 10^{51} erg. We therefore propose that the two sources comprise a single ring-like object, which is possibly a super bubble with a size of 49 pc \times 40 pc in the Galactic center region.
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