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arXiv 0910.4944astro-ph.HE
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银河系中心X射线灯丝的大尺度观测

A large-scale survey of X-ray filaments in the Galactic Centre

S. P. Johnson, H. Dong, Q. D. Wang

摘要:

我们提供了一个包含17个记录X射线特征的星表,这些特征位于钱德拉望远镜拍摄的银河系中心区域的68 \times 34弧分^2视场内。这些特征通过它们的形态学和光谱特性来描述。许多X射线特征具有非热谱,其很好地符合吸收幂律。在这17个特征中,我们发现了6个以前未被探测到的特征,其中4个位于以银河系中心为中心的20 \times 20弧分^2区域之外。在17个已确认的暗条中,有7个具有脉冲星风星云(PWNe)的形态和光谱特性,脉冲星风星云在2.0-10.0 keV波段的X射线光度为5 \times 10^32 - 10^34 erg s^-1,光子指数在Γ= 1.1 - 1.9之间。在一个特征中,我们建议强中性Fe Kα发射线是Sgr A* 过去活动的可能指示。对于G359.942-0.03,一个特殊的灯丝的兴趣,我们提出了一个冲压压力局限的恒星风气泡从一个大质量的恒星占的形态,光谱形状和6.7 keV的类氦铁发射检测到的模型。我们还提出了一个分段的频谱分析的两个功能的利益,G0.13-0.11和G359.89-0.08,以进一步研究其物理解释。该分析支持PWN场景中的这些功能。

英文摘要:

We present a catalogue of 17 filamentary X-ray features located within a 68\times34 arcmin^2 view centred on the Galactic Centre region from images taken by Chandra. These features are described by their morphological and spectral properties. Many of the X-ray features have non-thermal spectra that are well fitted by an absorbed power law. Of the 17 features, we find six that have not been previously detected, four of which are outside the immediate 20\times20 arcmin^2 area centred on the Galactic Centre. Seven of the 17 identified filaments have morphological and spectral properties expected for pulsar wind nebulae (PWNe) with X-ray luminosities of 5\times10^32 to 10^34 erg s^-1 in the 2.0-10.0 keV band and photon indices in the range of Γ= 1.1 to 1.9. In one feature, we suggest the strong neutral Fe Kαemission line to be a possible indicator for past activity of Sgr A*. For G359.942-0.03, a particular filament of interest, we propose the model of a ram pressure confined stellar wind bubble from a massive star to account for the morphology, spectral shape and 6.7 keV He-like Fe emission detected. We also present a piecewise spectral analysis on two features of interest, G0.13-0.11 and G359.89-0.08, to further examine their physical interpretations. This analysis favours the PWN scenario for these features.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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