球形吸积Kehagias-Sfetsos黑洞的阴影和光子环

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

International Journal of Modern Physics D Pub Date : 2023-10-18 DOI:10.1142/s0218271823500888

Mohaddese Heydari-Fard, Malihe Heydari-Fard, Nematollah Riazi

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引用次数: 1

摘要

通过在Hořava-Lifshitz引力框架下考虑Kehagias-Sfetsos黑洞，我们研究了这种被球形吸积流包围的黑洞的光学外观。对于静止/下落的球形吸积流，我们计算了观测到的比强度作为冲击参数的函数。我们还研究了Hořava参数和吸积物质对阴影和光子环亮度的影响。结果表明，Hořava参数的增大减小了阴影的大小，而阴影和光子环的光度增大。此外，我们还从事件视界望远镜对M87*和Sgr A*的观测数据中约束了Hořava参数。

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Shadows and photon rings of a spherically accreting Kehagias-Sfetsos black hole

By considering Kehagias–Sfetsos black hole in the framework of the Hořava–Lifshitz gravity, we study the optical appearance of such black holes surrounded by spherical accretion flow. For the static/infalling spherical accretion flow, we compute the observed specific intensity as a function of impact parameter. We also investigate the effect of the Hořava parameter and accreting matter on the luminosity of shadows and photon rings. It is found that an increase in the Hořava parameter decreases the shadow size, while the shadows and photon rings luminosities increase. Moreover, we constrain the Hořava parameter from the observational data reported by the Event Horizon Telescope for M87* and Sgr A*.

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来源期刊

International Journal of Modern Physics D 地学天文-天文与天体物理

CiteScore

3.80

自引率

9.10%

发文量

181

审稿时长

4-8 weeks

期刊介绍： Gravitation, astrophysics and cosmology are exciting and rapidly advancing fields of research. This journal aims to accommodate and promote this expansion of information and ideas and it features research papers and reviews on theoretical, observational and experimental findings in these fields. Among the topics covered are general relativity, quantum gravity, gravitational experiments, quantum cosmology, observational cosmology, particle cosmology, large scale structure, high energy astrophysics, compact objects, cosmic particles and radiation.