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Global distribution of Fe Kα lines in the galactic center region observed with the Suzaku satellite

机译:朱雀卫星观测到的银河系中心区域FeKα线的全球分布

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We surveyed spatial profiles of the Fe Kα 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 Kα line complex into three lines of Fe I, Fe XXV, and Fe XXVI Kα, and obtained their spatial intensity profiles with a resolution of ~0.°1. We compared the Fe XXV Kα profile with a stellar mass distribution (SMD) model made from near infrared observations. The intensity profile of Fe XXV Kα was nicely fitted with the SMD model in the GRXE region, while that in the GCDX region showed a 3.8±0.3 (0.°2 < |l| < 1.°5) or 19±6 (|l | < 0.°2) times excess over the best-fit SMD model in the GRXE region. Thus, Fe XXV Kα in the GCDX is hardly explained by the same origin of the GRXE. In the case of a point-source origin, a new population with the extremely strong Fe XXV Kα line is required. An alternative possibility is that the majority of the GCDX is truly diffuse optically thin thermal plasma.
机译:我们用朱雀卫星调查了银河系中心扩散X射线(GCDX)中FeKα线的空间分布,包括从GCDX到银河脊X射线发射(GRXE)的过渡区域。我们将FeKα线配合物分解为Fe I,Fe XXV和Fe XXVIKα的三个线,并获得了它们的空间强度轮廓,分辨率为〜0.°1。我们将Fe XXVKα谱与通过近红外观测得到的恒星质量分布(SMD)模型进行了比较。 Fe XXVKα的强度分布与GRXE区域的SMD模型非常吻合,而GCDX区域的强度分布为3.8±0.3(0.°2 <| l | <1.°5)或19±6( | l | <0.°2)是GRXE区域中最适合SMD模型的乘积。因此,GCDX中的Fe XXVKα很难用GRXE的相同来源来解释。在点源起源的情况下,需要具有极强的Fe XXVKα线的新种群。另一种可能性是,GCDX的大部分是真正扩散的光学薄热等离子体。

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