The shadow and photon sphere of the charged black hole in Rastall gravity

Guo, Sen; He, Kun; Li, Guan-Ru; Li, Guoping

doi:10.1088/1361-6382/ac12e4

Cited by 49 publications

(24 citation statements)

References 39 publications

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“…In our previous work, we investigated the shadow and photon sphere of a charged BH with a perfect fluid radiation field (PFRF) surrounded by the static/infalling spherical accretion within the framework of the Rastall gravity. It is found that the shadow luminosity of this BH with infalling spherical accretion is dimmer than that of the static spherical accretion, but the photon sphere luminosity is brighter than the static one [29]. It is well known that the radiation received by our telescope comes not from the BHs themselves, but instead originates in the accretion disks which surround them.…”

Section: Introductionmentioning

confidence: 87%

Observable characteristics of the charged black hole surrounded by thin disk accretion in Rastall gravity

Guo,

Li,

Liang

2022

Preprint

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The observable characteristics of the charged black hole (BH) surrounded by a thin disk accretion are investigated in the Rastall gravity. We found that the radii of the direct emission, lensing ring, and photon ring dramatically increased as the radiation field parameter increases, but they only weakly depend on the BH charge. Three positions of the radiation accretion disk relative to the BH are considered, i.e., the innermost accretion disk is closed to the radii of the innermost stable circular orbit, the photon ring of the BH, and the event horizon of the BH. The observed images in three cases respectively are obtained. It is found that the total observed flux is dominated by the direct emission, the lensing ring provides a small contribution, and the photon ring is negligible. The lensing and photon rings could not be observed in the blurred image with the EHT resolution. Our results suggest that the observable characteristics of the charged BH surrounded by the thin disk accretion in the Rastall gravity depend on both the BH space-time structure and the position of the radiating accretion disk with respect to the BH. The research of these BH images may serve as a probe for the BH-disk structure in M87 * like nearby active galactic nuclei.

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Section: Introductionmentioning

confidence: 87%

Observable characteristics of the charged black hole surrounded by thin disk accretion in Rastall gravity

Guo,

Li,

Liang

2022

Preprint

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“…Guo et al considered a charged BH surrounded by a perfect fluid radiation field within the framework of the Rastall gravity. They investigated the shadow and pho-ton sphere of this BH with the static/infalling spherical accretion background and obtained that the shadow luminosity of this BH with infalling spherical accretion is dimmer than that of the static spherical accretion, but the photon sphere luminosity is brighter than the static one [27]. Notably, they also showed that the luminosities of both the shadows and rings of the Hayward BH are affected by the accretion flow property and the BH magnetic charge [28].…”

Section: Introductionmentioning

confidence: 99%

QED and accretion flow models effect on optical appearance of Euler–Heisenberg black holes

Zeng

et al. 2022

Eur. Phys. J. C

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Taking the quantum electrodynamics (QED) effect into account, we investigate the geometrical-optics appearance of the Euler–Heisenberg (EH) black hole (BH) under the different accretion flows context, which depends on the BH space-time structure and different sources of light. The more significant magnetic charge leads to the smaller shadow radius for the EH BH, while the different values of the EH parameter do not ruin it. Different features of the corresponding two-dimensional shadow images are derived for the three optically thin accretion flow models. It is shown that the total observed intensity in the static spherical accretion flow scenario leads than that of the infalling spherical accretion flow under same parameters, but the size and position of the EH BH shadows do not change in both of these accretions flows, implying that the BH shadow size depends on the geometric space-time and the shadows luminosities rely on the accretion flow morphology. Of particular interest is that a thin disk accretion model illuminated the BH, we found that the contribution of the lensing ring to the total observed flux is less than $$5\%$$ 5 % , and the photon ring is less than $$2\%$$ 2 % , indicating that the direct emission dominates the optical appearance of the EH BH. It is also believed that the optical appearance of the BH image depends on the accretion disk radiation position in this scenario, which can serve as a probe for the disk structure around the active galactic nucleus (AGN) of M87$$^{*}$$ ∗ like.

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“…The optical appearance of black holes in the context of Rastall gravity with different spherical accretions has been also studied in Ref. [35]. For further studies about the effect of the location and profile of accretion flow which surrounded the black hole space-times in alternative gravity theories see, [36]- [57].…”

Section: Introductionmentioning

confidence: 99%

Effect of quintessence dark energy on the shadow of Hayward black holes with spherical accretion

Heydari-Fard¹

2022

Preprint

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It is believed that the astrophysical black holes are surrounded by a luminous accretion flow that is a necessary ingredient for imaging a black hole. In this paper, we study the influence of quintessence dark energy on the shadow images of a Hayward black hole surrounded by the static and infalling spherical accretion flow. We find the effect of the magnetic charge and the state parameter of quintessence matter on the horizons, photon sphere and impact parameter of the quintessence Hayward black hole. The observed specific intensity of the shadow and also the shadow and photon ring luminosities of the quintessence Hayward black hole in two different spherically accretion flow are investigated. Comparing the results of spherically accreting Hayward black hole with and without quintessence matter shows that in the presence of quintessence dark energy the shadow and photon rings radius and also their luminosity increase, while the observed specific intensity of the shadow decreases.

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The shadow and photon sphere of the charged black hole in Rastall gravity

Cited by 49 publications

References 39 publications

Observable characteristics of the charged black hole surrounded by thin disk accretion in Rastall gravity

Observable characteristics of the charged black hole surrounded by thin disk accretion in Rastall gravity

QED and accretion flow models effect on optical appearance of Euler–Heisenberg black holes

Effect of quintessence dark energy on the shadow of Hayward black holes with spherical accretion

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