利用XRISM/Resolve对PDS456宽线区的铁Kα线进行观测
Fe K$α$ line from the Broad Line Region of PDS456 with XRISM/Resolve
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中文总结 AI 辅助
研究利用XRISM上X射线微热量计Resolve的能量分辨率，对高光度类星体PDS 456宽线区的铁Kα线进行观测，通过分析其蓝移、宽度、柱密度和等效宽度等，揭示了相关特征及可能存在的分层介质，探测了X射线鲍德温效应高光度端。
中文摘要 AI 辅助
高光度、高质量且可能超爱丁顿的类星体PDS 456以其极端动态的环境而闻名。从毫米波到X射线波段的大量观测特征显示了从吸积盘到星系尺度的全尺度能量外流。光学和紫外波段的宽发射线显示出显著宽度和视线速度。近红外干涉测量揭示了部分外流的宽线区。借助XRISM上X射线微热量计Resolve前所未有的能量分辨率，我们探测到中性铁Kα线，这是围绕活动星系核的冷物质的主要示踪剂。该线的蓝移（\(v_{\rm out}=2700\) km s\(^{-1}\)）和宽度（\(\sigma \leq 700\) km s\(^{-1}\)）处于光学-紫外发射线值范围的下限，可能表明存在分层介质。推导得出的柱密度\(N_{\rm H} \approx 10^{22}\) cm\(^{-2}\)，明显低于宽线区的预期值，再次与复合发射一致。极小的等效宽度（9 eV）是文献中最小的测量值之一，探测了所谓的岩泽-谷口（或X射线鲍德温）效应的高光度端。
英文摘要
The high-luminosity, high-mass and likely super-Eddington quasar PDS 456 is known for its extremely dynamic environment. A wealth of observational features from the millimetric up to the X-ray band shows energetic outflows at all scales, from accretion disc up to galaxy scales. Broad Emission Lines in the optical and UV show significant widths and line-of-sight velocities. Moreover, NIR interferometry revealed a partially outflowing Broad Line Region. Thanks to the unprecedented energy resolution of the X-ray microcalorimeter Resolve onboard XRISM, we detect a neutral Fe K$α$ line, the main tracer of cold matter around AGNs. The line blueshift ($v_{\rm out}=2700$ km s$^{-1}$) and width ($σ\leq 700$ km s$^{-1}$) are on the lower bound of the range of values of the optical-UV emission lines, possibly suggesting a stratified medium. The derived column density, $N_{\rm H} \approx 10^{22}$ cm$^{-2}$, is significantly lower than what expected for Broad Line Regions, again in agreement with a composite emission. The very small Equivalent Width (9 eV) marks one of the smallest measurements in the literature and probes the high-luminosity end of the so-called Iwasawa-Taniguchi (or X-ray Baldwin) effect.
