Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor

Zhang, Zelin; Chen, Songbai; Qin, Xin; Jing, Jiliang

doi:10.48550/arxiv.2106.07981

Cited by 7 publications

(7 citation statements)

References 20 publications

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“…Especially, analyzing the polarization information in black hole images can probe further the magnetic field configuration and the powerful jet near black hole, which is beneficial to put insight into physics in the strong field region and to check theories of gravity. Thus, a lot of efforts have been devoted to investigating polarized images for various black holes [9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Polarization distribution in the image of a synchrotron emitting ring around regular black holes

Liu¹,

Chen²,

Jing³

2022

Preprint

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We have studied the polarized image of a synchrotron emitting ring around regular Hayward black hole and Bardeen black hole, respectively. Each of them carries a magnetic field itself in terms of gravity coupled to a nonlinear electrodynamics. Our results show that the main features of the polarization images of emitting rings are similar in these two regular black hole spacetimes. With the increase of magnetic charge parameter, the polarization intensity and electric vector position angle in the image plane increase in both Hayward black hole and Bardeen black hole spacetimes. We also investigate the differences of polarization intensity and electric vector position angle between in the regular black hole spacetime and in the Schwarzschild case, which indicates that the differences in the Hayward black hole spacetime are smaller than those in the Bardeen black hole. We also find the effects of the magnetic charge parameter on the Strokes Q − U loops slightly larger in Bardeen black hole spacetime. These information stored in the polarization image around Hayward and Bardeen black holes could help us to understand regular black holes and the gravity coupled a nonlinear electrodynamics.

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Section: Introductionmentioning

confidence: 99%

Polarization distribution in the image of a synchrotron emitting ring around regular black holes

Liu¹,

Chen²,

Jing³

2022

Preprint

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“…Moreover, the analysis show that the polarization patterns depend also on the strongly curved spacetime near the black holes. Thus, study of polarized images of black holes is beneficial to probe the matter distribution and the related physical process around black holes [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], even check theories of gravity.…”

Section: Introductionmentioning

confidence: 99%

Polarized image of a rotating black hole in Scalar-Tensor-Vector-Gravity theory

Xin¹,

Chen²,

Zhang³

et al. 2022

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The polarized images of a synchrotron emitting ring are studied in the spacetime of a rotating black hole in the Scalar-Tensor-Vector-Gravity (STVG) theory. The black hole owns an additional dimensionless MOG parameter described its deviation from Kerr black hole. The effects of the MOG parameter on the observed polarization vector and Strokes Q − U loops depend heavily on the spin parameter, the magnetic field configuration, the fluid velocity and the observation inclination angle. For the fixed MOG parameter, the changes of the polarization vector in the image plane are similar to those in the Kerr black hole case. The comparison of the polarization images between Kerr-MOG black hole and M87* implies that the STVG-MOG theory could be consistent with the present astronomical observation from the polarization image of M87*.

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“…And importantly, it turns out that the size and intensity of the bright ring are closely related to the location of thin disk [68]. In this case, an optically observational appearance of thin-shell wormhole and the polarized image of black hole have been carefully addressed later, where some interesting results are obtained [69,70]. Considering the case that the spherically symmetric accretion is infalling, shadow and photon sphere of black hole are also investigated in later studies [71][72][73].…”

Section: Introductionmentioning

confidence: 99%

Influence of dark matter on shadows and rings of a brane-world black hole illuminated by various accretions

Zeng¹,

He²,

Li³

2021

Preprint

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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 α and dark matter parameter β, while the impact parameter b p decreased with α and increased with β. 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(ν 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 β with the aid of the data of the shadow of M87.

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Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor

Cited by 7 publications

References 20 publications

Polarization distribution in the image of a synchrotron emitting ring around regular black holes

Polarization distribution in the image of a synchrotron emitting ring around regular black holes

Polarized image of a rotating black hole in Scalar-Tensor-Vector-Gravity theory

Influence of dark matter on shadows and rings of a brane-world black hole illuminated by various accretions

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