发表机构
Chengdu Neusoft University; Chongqing Bashu Science City Secondary School; College of Physics, Chongqing University（成都东软学院; 重庆巴蜀科学城中学校; 重庆大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过模拟厚吸积盘照亮的Schwarzschild-MOG黑洞阴影与偏振图像，发现MOG参数增大并增亮高阶光子环、拓宽阴影，倾角增强阴影内偏振，为EHT/ngEHT偏振观测约束MOG提供理论诊断。
AI 中文摘要
近期EHT偏振观测为近地平线物理和修正引力提供了强有力的探测手段。我们研究了被几何厚、光学薄吸积流照亮的静态Schwarzschild-MOG黑洞的阴影和偏振图像。采用唯象模型和Hou盘模型，并求解零测地线和相对论辐射转移，我们研究了MOG参数、倾角、各向异性同步辐射和流几何如何影响总强度和线偏振。研究发现，MOG参数主要使高阶光子环增大并变亮，同时拓宽阴影，而倾角打破轴对称性并增强阴影内部的偏振发射。Hou盘模型抑制了赤道外的辐射干涉，并将偏振信号局域在高阶环内。电矢量位置角（EVPA）图案大多呈方位角分布，但在透镜图像附近变化迅速。这些结果为利用EHT/ngEHT偏振观测约束MOG提供了理论诊断依据。
英文摘要
Recent EHT polarimetric observations provide a powerful probe of near-horizon physics and modified gravity. We investigate the shadow and polarization images of a static Schwarzschild-MOG black hole illuminated by geometrically thick, optically thin accretion flows. Adopting a phenomenological model and the Hou disk model, and solving null geodesics and relativistic radiative transfer, we study how the MOG parameter, inclination angle, anisotropic synchrotron emission, and flow geometry affect the total intensity and linear polarization. It is found that the MOG parameter mainly enlarges and brightens higher-order photon rings and broadens the shadow, while the inclination angle breaks axial symmetry and enhances polarized emission inside the shadow. The Hou disk model suppresses off-equatorial radiative interference and localizes polarization signals within higher-order rings. Electric vector position angle (EVPA) patterns are mostly azimuthal but vary rapidly near lensed images. These results provide theoretical diagnostics for constraining MOG with EHT/ngEHT polarimetric observations.
Comments32 pages, 9 figures
