General Relativity and Quantum Cosmology
[Submitted on 9 Nov 2021 (v1), last revised 9 Jun 2022 (this version, v2)]
Title:Effect of dark matter on shadows and rings of a brane-world black hole illuminated by various accretions
View PDFAbstract:In this paper, by taking the accretions into account, the observational shadows and rings casted by the Brane-world black hole are numerically investigated when the observer located at the cosmological horizon. The results here show that the radius $r_p$ of photon sphere increased with cosmological parameter $\alpha$ and dark matter parameter $\beta$, while the impact parameter $b_p$ decreased with $\alpha$ and increased with $\beta$. For the thin-disk accretion, it turns out that the total observed intensity are mainly composed of the direct emission, while lensing ring and photon ring only contribute a small contribution and a negligible contribution, respectively. And, we find that shadow and rings exhibit some different and interesting features when the disk located at different positions. For the static and infalling spherical accretions, it is obvious that the size of shadow is always the same for both accretions, which means that shadow is only related to the geometry of space time in this case. The luminosity of shadow and photon sphere are closely related to the Doppler effect and the emissivity per unit volume $j({\nu_e})$. In addition, the influence of dark matter and cosmological constant on observed intensity of shadows and rings are carefully emphasized throughout of this paper. Finally, we obtained the burring images of shadows and rings by using the nominal resolution of the Event Horizon Telescope, and studied the upper limits on the X-clod dark matter parameter $\beta$ with the aid of the data of the shadow of M87.
Submission history
From: Guo-Ping Li [view email][v1] Tue, 9 Nov 2021 12:47:32 UTC (12,514 KB)
[v2] Thu, 9 Jun 2022 03:21:12 UTC (13,800 KB)
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