Shadow images and observed luminosity of the Bardeen black hole surrounded by different accretions
Shadow images and observed luminosity of the Bardeen black hole surrounded by different accretions
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DOI：
10.1088/1674-1137/ac67fe
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发表时间：
2021-03
影响因子：
3.6
通讯作者：
K. He 何;Sen 森 Guo 郭;Shuang-Cheng 双成 Tan 谭;G. Li 李
中科院分区：
文献类型：
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作者：
K. He 何;Sen 森 Guo 郭;Shuang-Cheng 双成 Tan 谭;G. Li 李
本文通过研究光子在黑洞附近区域的运动，研究了各种吸积模型下黑洞的阴影和观测性质。分析了相关物理参数变化时阴影成像和观测亮度的变化。对于不同的球形吸积背景，我们发现阴影的半径和光子球的位置都没有改变，但在下落吸积模型中观测到的阴影强度明显低于静态情况。我们还研究了当黑洞被光学薄吸积盘包围时，光子环、透镜环和直接辐射对总观测通量的贡献。结果表明，在不同的发射模式下，观测亮度主要由直接发射决定，透镜环提供的观测通量仅占很小一部分，光子环提供的观测通量可以忽略不计。通过与Schwarzschild时空的比较，我们发现相关状态参数的存在或变化会极大地影响黑洞阴影的形状和观测强度。这些结果支持了态参数的变化会影响时空结构从而影响黑洞阴影观测特征的理论。
In this paper, by exploring photon motion in the region near a Bardeen black hole, we studied the shadow and observed properties of the black hole surrounded by various accretion models. We analyzed the changes in shadow imaging and observed luminosity when the relevant physical parameters are changed. For the different spherical accretion backgrounds, we find that the radius of shadow and the position of the photon sphere do not change, but the observed intensity of shadow in the infalling accretion model is significantly lower than that in the static case. We also studied the contribution of the photon rings, lensing rings and direct emission to the total observed flux when the black hole is surrounded by an optically thin disk accretion. Under the different forms of the emission modes, the results show that the observed brightness is mainly determined by direct emission, while the lensing rings will provide a small part of the observed flux, and the flux provided by the photon ring is negligible. By comparing our results with the Schwarzschild spacetime, we find that the existence or change of relevant status parameters will greatly affect the shape and observed intensity of the black hole shadow. These results support the theory that the change of state parameter will affect the spacetime structure, thus affecting the observed features of black hole shadows.