标题： 安布里奥斯的观测由罗西X射线时变探测器 显示英文标题

标题： Observation of Cen A by the Rossi X-ray Timing Explorer

摘要： 罗西X射线时变探测器于1996年8月14日对射电星系半人马座A进行了10 ks的短时间观测。 对2.5-240 keV组合光谱的分析显示，存在一个高度吸收（NH=9.42+/-0.24 e22 cm-2）的主要幂律（指数=1.86+/-0.015），以及由于冷物质荧光产生的铁线（EW=162+/-25 eV）。 不需要来自喷流、主要通量散射到视线方向，或通过部分吸收体看到的主要通量。 在95%置信水平下，铁线宽度无法分辨（sigma < 0.54 keV）。 在过去二十年的测量中没有观察到铁线通量的显著变化，而整体连续谱通量变化超过了四倍，这表明线发射区域距离主要发射区域较远。 虽然射电安静的赛弗特星系表现出可归因于冷物质康普顿反射的光谱成分，但半人马座A没有显示出这样的成分（暴露立体角比 < 0.09）。 这支持了活动星系的统一模型，该模型认为赛弗特2型和低光度射电星系之间差异很小。 显示英文摘要

摘要： The Rossi X-ray Timing Explorer made a short (10 ks) observation of the radio galaxy Centaurus A on 14 August 1996. Analysis of the combined 2.5-240 keV spectrum has revealed a heavily absorbed(NH=9.42+/-0.24 e22 cm-2) primary power law (index=1.86+/-0.015) and an iron line due to fluorescence of cold matter (EW=162+/-25 eV). Flux from either a jet, primary flux scattered into the line of sight, or primary flux seen through a partial absorber was not required. The iron line width is unresolved at the 95% confidence level (sigma < 0.54 keV). No significant variability in the iron line flux is seen from measurements over the last two decades, while the overall continuum flux varied by more than a factor of four, which implies that the line emission region is distant from that of the primary emission. While radio-quiet Seyfert galaxies exhibit spectral components attributable to Compton reflection from cold matter, Cen A reveals no such component (exposed solid angle ratio < 0.09). This supports unified models of active galaxies that have little difference between Seyfert 2 and low luminosity radio galaxies