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arXiv 1107.2808astro-ph.HE
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用朱雀卫星观测银河系中心区Fe K α线的全球分布

Global Distribution of Fe K alpha Lines in the Galactic Center Region Observed with the Suzaku Satellite

Hideki Uchiyama, Masayoshi Nobukawa, Takeshi Go Tsuru, Katsuji Koyama, Hironori Matsumoto

摘要:

利用朱雀卫星测量了银河系中心扩散X射线(GCDX)中Fe K $α$线的空间分布,包括从GCDX到银河系脊X射线发射(GRXE)的过渡区。我们将Fe K $α$线分解为Fe \emissiontype{I}、Fe \emissiontype{XXV}和Fe \emissiontype{XXVI} K $α$三条线,得到了它们的空间强度分布,其分辨率为$\sim \timeform{0D.1}$。我们比较了Fe \emissiontype{XXV} K $α$配置文件与恒星质量分布(SMD)模型从近红外观测。在GRXE区,Fe \emissiontype{XXV} K $α$的强度分布与SMD模型拟合较好,而在GCDX区,$3.8\pm0.3$ $(\timeform{0D.2}<|l|<\timeform{1D.5})$或$19\pm6$ $(|l|<\timeform{0D.2})$比最佳拟合SMD模型高出一倍.因此,GCDX中的Fe \emissiontype{XXV} K $α$很难用GRXE的相同起源来解释。在点源起源的情况下,需要具有极强的Fe \emissiontype{XXV} K $α$线的新总体。另一种可能性是,大多数的GCDX是真正的扩散光学薄的热等离子体。

英文摘要:

We have surveyed spatial profiles of the Fe K$α$ lines in the Galactic center diffuse X-rays (GCDX), including the transient region from the GCDX to the Galactic ridge X-ray emission (GRXE), with the Suzaku satellite. We resolved Fe K$α$ line complex into three lines of Fe \emissiontype{I}, Fe \emissiontype{XXV} and Fe \emissiontype{XXVI} K$α$, and obtained their spatial intensity profiles with the resolution of $\sim \timeform{0D.1}$. We compared the Fe \emissiontype{XXV} K$α$ profile with a stellar mass distribution (SMD) model made from near infrared observations. The intensity profile of Fe \emissiontype{XXV} K$α$ is nicely fitted with the SMD model in the GRXE region, while that in the GCDX region shows $3.8\pm0.3$ $(\timeform{0D.2}<|l|<\timeform{1D.5})$ or $19\pm6$ $(|l|<\timeform{0D.2})$ times excess over the best-fit SMD model in the GRXE region. Thus Fe \emissiontype{XXV} K$α$ in the GCDX is hardly explained by the same origin of the GRXE. In the case of point source origin, a new population with the extremely strong Fe \emissiontype{XXV} K$α$ line is required. An alternative possibility is that the majority of the GCDX is truly diffuse optically thin thermal plasma.

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