发表机构
Massachusetts Institute of Technology; University of California, Berkeley; Columbia University; Flatiron Institute; Center for Astrophysics — Harvard & Smithsonian; Harvard University; New York University; Technion（麻省理工学院; 加州大学伯克利分校; 哥伦比亚大学; 平顿研究所; 哈佛-史密森天体物理中心; 哈佛大学; 纽约大学; 以色列理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过XMM-Newton观测ZTF19acnskyy/“Ansky”的QPEs，构建时变风模型，揭示宽角相对论性外流驱动QPE，为其能量、辐射机制等提供定量约束。
AI 中文摘要
准周期性爆发（QPEs）是源自超大质量黑洞（SMBHs）的周期性X射线辐射爆发，是一种前所未有的结构化、高振幅SMBH变异性类型，但其规律性、时标、能量和辐射的物理起源尚不明确。我们对ZTF19acnskyy/“Ansky”中的QPEs开展了新的XMM-Newton观测，这是迄今对单个爆发源最深的观测。X射线光谱显示出随时间演化的P Cygni轮廓，包含Fe XIX-XXIV的L壳层跃迁产生的蓝移吸收和红移发射，柱密度N_H~10^22-23 cm^-2，整体速度|v_w/c|~0.2，表明每次爆发期间存在相对论性质量抛射。我们构建了风启动的时变分析模型，自洽计算其演化光度和电离特性，发现宽角外流可同时产生光变曲线和光谱线，其质量损失率M_dot~10^-9-10^-8 M☉/s，以L_X/E_K_dot~0.1的效率动力学驱动X射线辐射。每次爆发抛射~10^-3 M☉的质量和≥10^49 erg的动能，若基础质量储备为~1 M☉，则QPE寿命上限为≤30年，且这些爆发可能产生可探测的混响和反馈多波段信号。这些测量为QPE的能量、辐射机制及其循环到核周环境的质量/能量提供了新的定量约束，也为与QPE的物理模型和流体动力学模拟直接比较提供了观测探针。
英文摘要
Quasi-periodic eruptions (QPEs) are recurring bursts of X-ray radiation originating from supermassive black holes (SMBHs). They are an unprecedented type of structured, high-amplitude SMBH variability, but the physical origins of their regularity, timescales, energetics, and emission are uncertain. We present new XMM-Newton observations of the QPEs in ZTF19acnskyy/"Ansky", constituting the deepest observations of individual bursts in any source thus far. The X-ray spectra reveal time-evolving P Cygni profiles comprising blueshifted absorption and redshifted emission from L-shell transitions of Fe XIX-XXIV, with column densities $N_H\sim 10^{22-23}$ cm$^{-2}$ and bulk velocities of $|v_w/c|\sim 0.2$, indicating relativistic mass ejections during each eruption. We construct a time-dependent analytical model of a wind turning on to self-consistently compute its evolving luminosity and ionization properties, and find that the light curve and spectral lines can be simultaneously produced by a wide-angle outflow with $\dot{M}\sim 10^{-9}-10^{-8}\,M_\odot$ s$^{-1}$ kinetically powering the X-rays with an efficiency of $L_X/\dot{E}_K\sim 0.1$. For a covering fraction $f_Ω\sim0.5$, each eruption ejects $\sim 10^{-3}\,M_\odot$ and $\gtrsim 10^{49}$ erg of kinetic energy, setting an upper bound on the QPE lifetime of $\lesssim1000$ bursts if the underlying mass reservoir is $\sim1 M_\odot$, and implying that the bursts may result in detectable multiwavelength signatures of reverberation and feedback. These measurements provide new quantitative constraints on QPE energetics, emission mechanisms, and the mass/energy they recycle into their circumnuclear environments, as well as an observational probe for direct comparison with physical models and hydrodynamical simulations of QPEs.
CommentsFinal version accepted to ApJ Letters
