局域暗物质壳层中四极形变致密天体的阴影
Shadow of quadrupole-deformed compact objects in a local dark matter shell
AI总结：
本研究探究四极形变致密天体的阴影与光子环结构，分析四极参数、吸积盘辐射轮廓及暗物质晕对阴影的影响，发现其与球对称黑洞观测特征存在简并性，可通过引力物理光学实验验证。
摘要：
本工作研究了致密天体附近产生的辐射轮廓的观测特性，即阴影和光子环结构。具体而言，我们考虑了一个由两个四极参数表征的扭曲形变致密天体，其被光学薄且几何薄的吸积盘环绕，吸积盘具有不同的辐射轮廓，这些轮廓在辐射源参考系中由Johnson的Standard-Unbound（SU，标准无束缚）分布建模。在这些假设下，我们生成了正对着观测者的观测强度轮廓和阴影图像。我们的结果表明，由于四极参数的改变会影响最内稳定圆轨道（ISCO）的半径以及赤道面上的不稳定光子轨道，观测到的阴影图像及其特性会受到四极参数和辐射轮廓的显著影响。此外，我们分析了暗物质晕的存在对所考虑的观测印记的影响，并证实晕中所含物质的增加或晕的长度尺度的减小都会导致观测到的阴影尺寸增大。我们的结果表明，扭曲形变致密天体的观测特征与球对称黑洞的观测特征之间可能存在简并性，这可以通过与当前和未来一代引力物理光学实验的比较来评估。
英文摘要：
This work investigates observational properties, namely the shadow and photon ring structure, of emission profiles originating near compact objects. In particular, we consider a distorted and deformed compact object characterised by two quadrupole parameters and surrounded by an optically thin and geometrically thin accretion disk with different emission profiles modelled by Johnson's Standard-Unbound (SU) distribution in the reference frame of the emitter. Under these assumptions, we produce the observed intensity profiles and shadow images for a face-on observer. Our results indicate that, due to the fact that modifications of the quadrupole parameters affect the radius of the innermost stable circular orbit (ISCO) and the unstable photon orbits on the equatorial plane, the observed shadow images and their properties are significantly influenced by the quadrupole parameters and emission profiles. Furthermore, we analyse the impact of the presence of a dark matter halo in the observational imprints considered and verify that both the increase in the matter contained in the halo or the decrease in the length-scale of the halo lead to an increase in the size of the observed shadow. Our results indicate potential degeneracies between the observational features of distorted and deformed compact objects with those of spherically symmetric blackholes, which could be assessed by a comparison with the current and future generation of optical experiments in gravitational physics.
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