标题： XRISM/Resolve观测到的Cyg X-3的Fe K区域 显示英文标题

标题： The XRISM/Resolve view of the Fe K region of Cyg X-3

摘要： 天蝎座X-3（4U 2030+40，V1521 Cyg）是一个高亮度但神秘的X射线双星系统，由于存在大量的吸收物质，使得对其研究变得困难。高分辨率X射线光谱能够独特地探测到系统中光致电离气体的动力学特性。 本文报告了使用XRISM/Resolve光谱仪对Cyg X-3进行的观测，该光谱仪在2-10 keV能段提供了前所未有的光谱分辨率和灵敏度。我们检测到了吸收和发射中的多个运动学和电离分量，这些分量的叠加导致复杂的线轮廓，包括共振线上的强P-Cygni轮廓。显著的Fe XXV He$\alpha$和 Fe XXVI Ly$\alpha$发射复合体被清晰地分解为其特征精细结构跃迁。 自洽的光致电离建模使我们能够分离吸收和发射分量，并测量这些分量随双星轨道相位变化的速度。我们发现发射线的速度振幅明显高于吸收线。吸收线通常表现为蓝移，范围在${\sim}-500$-$600$公里每秒$^{-1}$。我们表明，风自然分解为一个相对平滑且大尺度的成分，可能起源于背景风本身，加上一个位于致密天体轨道附近的湍流更密集的结构。 显示英文摘要

摘要： The X-ray binary system Cygnus X-3 (4U 2030+40, V1521 Cyg) is luminous but enigmatic owing to the high intervening absorption. High-resolution X-ray spectroscopy uniquely probes the dynamics of the photoionized gas in the system. In this paper we report on an observation of Cyg X-3 with the XRISM/Resolve spectrometer which provides unprecedented spectral resolution and sensitivity in the 2-10 keV band. We detect multiple kinematic and ionization components in absorption and emission, whose superposition leads to complex line profiles, including strong P-Cygni profiles on resonance lines. The prominent Fe XXV He$\alpha$ and Fe XXVI Ly$\alpha$ emission complexes are clearly resolved into their characteristic fine structure transitions. Self-consistent photoionization modeling allows us to disentangle the absorption and emission components and measure the Doppler velocity of these components as a function of binary orbital phase. We find a significantly higher velocity amplitude for the emission lines than for the absorption lines. The absorption lines generally appear blueshifted by ${\sim}-500$-$600$km s$^{-1}$. We show that the wind decomposes naturally into a relatively smooth and large scale component, perhaps originating with the background wind itself, plus a turbulent more dense structure located close to the compact object in its orbit.