Cir X-1周围的复杂环境
A complex environment around Cir X-1
摘要：
我们提出了一个档案54 ks长的钱德拉观测奇特的源Cir X-1在相位通道0.223-0.261的结果。比较分析的X射线光谱，选择在不同的通量水平的源，使我们能够区分一个非常硬的状态，在一个低的计数率，和一个更亮，更软，高度吸收的光谱在耀斑活动的插曲，当未吸收的源光度约为三倍的值在硬状态。硬态的光谱清楚地显示了高度电离元素的发射线，而在耀斑状态下，光谱也显示了强的共振吸收线。在后一种状态中，最强烈和最有趣的特征存在于Fe K α区域：能量约为6.5 keV的非常宽的吸收线，这可能是由于中等电离铁离子（Fe XX - Fe XXIV）的共振吸收线的模糊混合。我们还观察到强的共振吸收线的Fe XXV和Fe XXVI，连同涂抹的吸收边高于7千电子伏。我们认为，在静态/硬状态的发射区域是由一个纯粹的光电离介质，可能存在于一个吸积盘，或光电离等离子体存在于一个光束流出。在耀斑状态的源经历增强的湍流吸积，修改吸积的几何形状和光学深度的气体周围的主要X射线源。
英文摘要：
We present the results of an archival 54 ks long Chandra observation of the peculiar source Cir X--1 during the phase passage 0.223-0.261. A comparative analysis of X-ray spectra, selected at different flux levels of the source, allows us to distinguish between a very hard state, at a low countrate, and a brighter, softer, highly absorbed spectrum during episodes of flaring activity, when the unabsorbed source luminosity is about three times the value in the hard state. The spectrum of the hard state clearly shows emission lines of highly ionized elements, while, during the flaring state, the spectrum also shows strong resonant absorption lines. The most intense and interesting feature in this latter state is present in the Fe K alpha region: a very broadened absorption line at energies ~ 6.5 keV that could result from a smeared blending of resonant absorption lines of moderately ionized iron ions (Fe XX - Fe XXIV). We also observe strong resonant absorption lines of Fe XXV and Fe XXVI, together with a smeared absorption edge above 7 keV. We argue that the emitting region during the quiescent/hard state is constituted of a purely photo-ionized medium, possibly present above an accretion disk, or of a photo-ionized plasma present in a beamed outflow. During the flaring states the source undergoes enhanced turbulent accretion that modifies both the accretion geometry and the optical depth of the gas surrounding the primary X-ray source.
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