论文标题
带有Suzaku档案数据的积聚磁盘电源2S 0921-630的X射线光谱
X-ray spectroscopy of the accretion disk corona source 2S 0921-630 with Suzaku archival data
论文作者
论文摘要
2S 0921 $ - $ 630是一种磨碎的低质量X射线二进制二进制（LMXB），其轨道周期为$ \ sim $ 9天。过去的X射线观察结果表明，2S 0921 $ - 630 $ 630具有扩展的积聚磁盘电晕（ADC），从中发出了大多数X射线。我们报告了2S 0921 $ -630的Suzaku档案数据分析的结果。平均X射线光谱是由黑体发射（$ kt _ {\ rm bb} \ sim 0.3 $ kev）由光学厚的气（``compton cloud'';光学深度$τ\ sim 21 $）构成的，并以$ \ sim 2 $ kev的温度与Thirteen Essistion Listsions Listsions Listsiess Listery。我们发现大多数发射线对应于高度离子化原子：O，NE，MG，SI，S，AR和Fe。还检测到了半中性铁（Fe I-XVII）的K $α$发射线和吸收边缘。半中立的铁K $α$线非常宽，宽度为$ 0.11 \ pm 0.02 $ kev in Sigma，这对应于开普勒运动以$ \ sim 10^9 $ cm的半径为单位。我们建议观察到的半中性铁线源自康普顿云外部的积聚磁盘的内部，即康普顿云的半径可能为$ \ sim 10^9 $ cm。
2S 0921$-$630 is an eclipsing low-mass X-ray binary (LMXB) with an orbital period of $\sim$ 9 days. Past X-ray observations have revealed that 2S 0921$-$630 has an extended accretion disk corona (ADC), from which most of the X-rays from the system are emitted. We report the result of our Suzaku archival data analysis of 2S 0921$-$630. The average X-ray spectrum is reproduced with a blackbody emission ($kT_{\rm bb} \sim 0.3$ keV) Comptonized by optically-thick gas (``Compton cloud''; optical depth $τ\sim 21$) with a temperature of $\sim 2$ keV, combined with thirteen emission lines. We find that most of the emission lines correspond to highly ionized atoms: O, Ne, Mg, Si, S, Ar, and Fe. A K$α$ emission line and an absorption edge of semi-neutral iron (Fe I -- XVII) are also detected. The semi-neutral iron K$α$ line is significantly broad with a width of $0.11 \pm 0.02$ keV in sigma, which corresponds to the Doppler broadening by the Kepler motion at a radius of $\sim 10^9$ cm. We suggest that the observed semi-neutral iron line originates at the inner part of the accretion disk in the immediate outside of the Compton cloud, i.e., the Compton cloud may have a radius of $\sim 10^9$ cm.
