Polarized image of an equatorial emitting ring around a 4D Gauss-Bonnet black hole

Qin, Xin; Chen, Songbai; Jing, Jiliang

doi:10.48550/arxiv.2111.10138

Cited by 7 publications

(8 citation statements)

References 47 publications

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“…In [15], EHT Collaboration developed a model of an equatorial magnetized fluid orbiting a Schwarzschild black to understand polarimetric images of black holes. Soon, this model has been generalized to a Kerr black hole spacetime and other black hole geometries arise from modified theory of gravity in [16][17][18]. Also, In virtue of such a model, one can investigate the polarized image for arbitrary emission radius, magnetic field geometry, equatorial fluid velocity, and observer inclination to match the astroobservation.…”

Section: Introductionmentioning

confidence: 99%

Polarized image of synchrotron radiations of hotspots in Schwarzschilld-Melvin black hole spacetime

Zhu¹,

Guo²

2022

Preprint

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We revisit the innermost stable circular orbits (ISCOs) of charged particles and study the polarized images of synchrotron radiations emitted from such orbiting hotspots on the equatorial plane in Schwarzchild-Melvin black hole spacetime. We obtain a constraint on the magnetic field to retain ISCOs for charged particles. In particular, we identify a critical value for the strength of the magnetic field B c that the circular orbits can have positive and negative angular momentums above B c while only one branch survive below B c . Furthermore, we investigate and discuss the primary and secondary images of circularly orbiting charged hotspots carrying the information of polarization directions observed by distant observers.

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Section: Introductionmentioning

confidence: 99%

Polarized image of synchrotron radiations of hotspots in Schwarzschilld-Melvin black hole spacetime

Zhu¹,

Guo²

2022

Preprint

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“…In this model, only the emission within a narrow range of radii R is considered, but the image of a finite thin disk can be produced by simply summing contributions from individual radii [23][24][25]. With this model, the polarization signatures for a four dimensional black hole in Gauss-Bonnet theory is analyzed in [26].…”

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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“…Although only the emission within a narrow range of radii R is considered in this simple model, it clearly reveals that the polarization signatures are dominated by magnetic field configuration, black hole spin and observer inclination. With this model, the polarized image of an equatorial emitting ring has been studied for 4D Gauss-Bonnet black hole [17] and regular black holes [18]. The polarized distribution of the image originating from synchrotron radiations of the charged point particle in curved spacetime has been investigated in [19,20].…”

Section: Introductionmentioning

confidence: 99%

Image of Bonnor black dihole with a thin accretion disk and its polarization information

Zhang,

Chen,

Jing

2022

Preprint

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We have studied the image of Bonnor black dihole surrounded by a thin accretion disk where the electromagnetic emission is assumed to be dominated respectively by black body radiation and synchrotron radiation. Our results show that the intensity of Bonnor black dihole image increases with the magnetic parameter and the inclination angle in both radiation models. The image of Bonnor black dihole in the synchrotron radiation model is one order of magnitude brighter than that in the black body radiation model, but its intensity in the former decreases more rapidly with the radial coordinate. Especially, for the synchrotron radiation model, the intensity of the secondary image is stronger than that of the direct image at certain an inclination angle. We also present the polarization partners for the images of Bonnor black dihole arising from the synchrotron radiation, which depend sharply on the magnetic parameter and inclination angle. Finally, we make a comparison between the polarimetric images of Bonnor black dihole and M87*. Our result further confirms that the image of black hole depends on the black hole's properties itself, the matter around black hole and the corresponding radiation occurred in the accretion disk.

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Polarized image of an equatorial emitting ring around a 4D Gauss-Bonnet black hole

Cited by 7 publications

References 47 publications

Polarized image of synchrotron radiations of hotspots in Schwarzschilld-Melvin black hole spacetime

Polarized image of synchrotron radiations of hotspots in Schwarzschilld-Melvin black hole spacetime

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

Image of Bonnor black dihole with a thin accretion disk and its polarization information

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