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arXiv 0801.4552astro-ph
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天鹅座环超新星遗迹的软X射线谱

Soft X-ray Spectroscopy of the Cygnus Loop Supernova Remnant

Randall L. McEntaffer, Webster Cash

摘要:

天鹅座X射线发射光谱测量(CyXESS)探空火箭有效载荷于2006年11月20日从白沙导弹靶场发射,获得了天鹅座环超新星遗迹的软X射线高分辨率光谱。新型X射线摄谱仪采用了线栅准直器,在极端离面安装光栅阵列,最终分散到气态电子倍增器(GEM)探测器的光谱。该仪器在两个显著特征中记录了43-49.5毫秒之间的65秒可用数据。第一个在45 nm附近的特征是由二级的\ion{O}{7}的He样三重态主导,一级的贡献来自\ion{Mg}{10}和\ion{Si}{9} - \ion{Si}{12},而第二个在47.5 nm附近的特征是一级的\ion{S}{9}和\ion{S}{10}。与光谱的拟合给出了在$\log(T)=6.2$($kT_e=0.14$ keV)和接近宇宙丰度的平衡等离子体。这与先前的观测结果一致,先前的观测结果表明,天鹅座圈的软X射线发射主要是由初始冲击波与天鹅座圈周围前体形成的空腔壁之间的相互作用决定的,并且这种相互作用可以使用平衡条件来描述。

英文摘要:

The Cygnus X-ray Emission Spectroscopic Survey (CyXESS) sounding rocket payload was launched from White Sands Missile Range on 2006 November 20 and obtained a high resolution spectrum of the Cygnus Loop supernova remnant in the soft X-rays. The novel X-ray spectrograph incorporated a wire-grid collimator feeding an array of gratings in the extreme off-plane mount which ultimately dispersed the spectrum onto Gaseous Electron Multiplier (GEM) detectors. This instrument recorded 65 seconds of usable data between 43-49.5 Åin two prominent features. The first feature near 45 Åis dominated by the He-like triplet of \ion{O}{7} in second order with contributions from \ion{Mg}{10} and \ion{Si}{9}-\ion{Si}{12} in first order, while the second feature near 47.5 Åis first order \ion{S}{9} and \ion{S}{10}. Fits to the spectra give an equilibrium plasma at $\log(T)=6.2$ ($kT_e=0.14$ keV) and near cosmic abundances. This is consistent with previous observations, which demonstrated that the soft x-ray emission from the Cygnus Loop is dominated by interactions between the initial blast wave with the walls of a precursor formed cavity surrounding the Cygnus Loop and that this interaction can be described using equilibrium conditions.

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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