发表机构
National Astronomical Observatories, Chinese Academy of Sciences; School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院国家天文台; 中国科学院大学天文与空间科学学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过三盘吸积模型模拟微引力透镜光变和能谱分布，发现Q J0158-4325的周期性微引力透镜变化最可能由等质量比（q~1）的超大质量双黑洞系统（总质量~10^9.5 M⊙）解释。
AI 中文摘要
本研究旨在检验具有三盘吸积结构的超大质量双黑洞（SMBBH）系统能否解释引力透镜类星体Q J0158-4325中观测到的约173天周期性微引力透镜变化和光谱能量分布（SED）。我们为SMBBH系统构建了一个三盘模型，包含了真实的吸积盘结构、轨道运动和微引力透镜效应。该模型用于模拟光学和X射线微引力透镜光变曲线及SED，并与长期光学监测、X射线观测以及HST和XSHOOTER的紫外-光学光谱进行比较。采用贝叶斯分析和MCMC拟合来约束模型参数。该模型成功再现了周期性微引力透镜变化。结合光变曲线和SED拟合，倾向于一个高质量比（q>0.5）的SMBBH系统，总质量约为10^9.5 M⊙，而近乎等质量的双星（q~1）与光学/紫外光谱及微引力透镜信号吻合最佳。该模型预测X射线微引力透镜振幅大于光学波段，但现有X射线观测缺乏足够精度以施加强约束。我们强调未来需要高频率监测以解决剩余的不确定性。本研究展示了结合多波段微引力透镜特征与光谱建模为SMBBH系统提供稳健约束的有效性，所开发的框架可应用于其他透镜类星体，以识别和表征候选SMBBH。
英文摘要
This study aims to test whether a supermassive binary black hole (SMBBH) system with a triple-disk accretion structure can explain the observed $\sim$173-day periodic microlensing variations and spectral energy distribution (SED) of the gravitationally lensed quasar Q J0158-4325. We construct a triple-disk model for the SMBBH system, incorporating realistic accretion disk structures, orbital motion, and microlensing effects. The model is used to simulate optical and X-ray microlensing light curves and SEDs, which are compared with long-term optical monitoring, X-ray observations, and UV-optical spectra from HST and XSHOOTER. Bayesian analysis and MCMC fitting are applied to constrain model parameters. The model successfully reproduces the periodic microlensing variations. Combined light curve and SED fitting favor a high mass ratio ($q>0.5$) SMBBH system with total mass $\sim 10^{9.5}M_\odot$, and nearly equal-mass binaries ($q\sim1$) provides the best agreement with both the optical/UV spectrum and the microlensing signal. This model predicts larger X-ray microlensing amplitudes than in the optical, but, the available X-ray observations lack the precision needed to place strong constraints. We emphasize the need for future high-cadence monitoring to resolve remaining uncertainties. This study demonstrates the effectiveness of combining multi-wavelength microlensing signatures with spectral modeling to provide robust constraints on SMBBH systems, with the developed framework applicable to other lensed quasars for identifying and characterizing candidate SMBBHs.
Comments13 pages, 12 figures
Journal refMNRAS 547, 1-13 (2026)
