Taub NUT黑洞周围薄吸积盘的热辐射

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS International Journal of Modern Physics D Pub Date : 2023-07-10 DOI:10.1142/s0218271823500645
Bakhtiyor Narzilloev, B. Ahmedov
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引用次数: 0

摘要

研究了重磁电荷对非旋转黑洞周围薄吸积盘热辐射特性的影响。所研究的系统由一个具有非零重磁电荷的非旋转黑洞和一个薄而光学厚度的Novikov–Thorne盘组成。研究发现,重磁电荷增强了中心黑洞的引力场,导致事件视界和最内侧稳定圆轨道(ISCO)半径增加。然而,由于重磁电荷的影响,吸积盘的最大辐射能通量减少,并从中心物体向外移动。吸积盘的热剖面也对黑洞的径向坐标和重磁电荷表现出类似的依赖性。吸积盘的辐射效率从大约6%下降到大约2%,随着重磁电荷值的增加[公式:见正文]。吸积盘的热光谱也向较低的频率移动,对应于来自吸积盘电磁辐射的引力红移,随着重磁电荷值的增加。可以得出这样的结论:重磁电荷的作用与黑洞自旋的作用相反。
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Thermal radiation of thin accretion disk around Taub-NUT black hole
The effects of a gravitomagnetic charge on the thermal radiation properties of a thin accretion disk surrounding a non-rotating black hole are studied. The studied system consists of a non-rotating black hole with a non-zero gravitomagnetic charge and a Novikov–Thorne disk that is thin and optically thick. It is found that the gravitomagnetic charge enhances the gravitational field of the central black hole, resulting in an increase in the event horizon and innermost stable circular orbit (ISCO) radii. However, the maximum flux of radiant energy from the accretion disk is reduced and shifted outward from the central object due to the effect of the gravitomagnetic charge. The thermal profile of the accretion disk also exhibits a similar dependence on the radial coordinate and the gravitomagnetic charge of the black hole. The radiative efficiency of the accretion disk decreases from around 6% to approximately 2% with an increase in the value of the gravitomagnetic charge by [Formula: see text]. The thermal spectra of the accretion disk are also shifted towards lower frequencies, corresponding to the gravitational redshift of electromagnetic radiation coming from the disk, with an increase in the value of the gravitomagnetic charge. One may conclude that the effect of the gravitomagnetic charge is opposite to the effect of black hole spin.
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来源期刊
International Journal of Modern Physics D
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.
期刊最新文献
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