AI 中文总结
研究几何厚光学薄吸积流中Konoplya-Zhidenko旋转非Kerr黑洞的阴影与偏振图像，发现变形参数增大高阶像尺寸，自旋和倾角增强不对称性，厚盘模型产生与薄盘模型显著不同的特征。
AI 中文摘要
我们研究了被几何厚光学薄吸积流包围的Konoplya-Zhidenko旋转非Kerr黑洞的阴影和偏振图像。吸积流由解析弹道近似吸积流模型描述。数值结果表明，阴影图像呈现出两个主要特征：一个外部亮环和一个内部暗区。前者对应于高阶像，而后者由黑洞事件视界产生。增加变形参数$\eta$不会显著改变高阶像的整体形状，但会增大其尺寸。增加自旋参数$a$和观测者倾角$\theta_o$会增强高阶像的不对称性，并使左侧强度远大于右侧。这种行为与参考系拖曳和相对论多普勒效应有关。在偏振图像中，高阶像区域的线偏振度远小于其他区域，且偏振矢量遍布整个像平面。这些结果表明，厚盘模型在强度图像和偏振图像中产生的特征与薄盘模型显著不同。在本工作所使用的框架内，观测到的强度和偏振特征可以作为底层时空几何和近视界吸积动力学的有效探针。
英文摘要
We investigate the shadow and polarization images of a Konoplya--Zhidenko rotating non-Kerr black hole surrounded by a geometrically thick and optically thin accretion flow. The accretion flow is described by an analytical ballistic approximation accretion flow model. The numerical results show that the shadow image exhibits two main features, an outer bright ring and an inner dark region. The former corresponds to higher-order images, while the latter is associated with photon capture by the black hole. Increasing the deformation parameter $η$ does not significantly change the overall shape of the higher-order images, but it enlarges their size. Increasing either the spin parameter $a$ or the observer inclination angle $θ_o$ enhances the asymmetry of the higher-order images and makes the intensity on the left side much larger than that on the right side. This behavior is associated with frame dragging and the relativistic Doppler effect. In the polarization images, the degree of linear polarization is much smaller in the higher-order image region than in other regions, and the polarization vectors extend over the whole image plane. Within the framework used in this work, these results illustrate how the spacetime geometry and near-horizon accretion dynamics jointly influence the intensity and polarization images.
Comments24 pages, 8 figures
