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:10.1140/epjc/s10052-021-09786-2

Cited by 39 publications

(17 citation statements)

References 38 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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“…As we know, the EHT image consists of a central dark area ("black hole shadow") and a surrounding bright ring ("photon ring"). Since the light rays in the vicinity of a black hole are highly bent, the bright ring is actually composed of an infinite sequence of lensed photon emissions from a nearby accretion disk [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. While the observed profile depends on the less-understood plasma physics in the accretion disk as well, the light bending effect is mainly determined by the spacetime geometry.…”

Section: Introductionmentioning

confidence: 99%

Multi-level images around Kerr-Newman black holes

Hou¹,

Liu²,

Guo³

et al. 2022

Preprint

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We study the lensing effects of Kerr-Newman (KN) black holes and the multi-level images of luminous sources around the black holes. We obtain the analytic forms of the lens equations in KN spacetime and derive approximately their limiting forms for photon emissions near the bounded photon orbits. After deriving the expressions of three key parameters γ, δ and τ , we investigate the primary, the secondary and the higher-order images of spherical sources and equatorial disk-like sources. In particular, we find that the charge of KN black hole has a significant effect on the higher-order images.

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“…The polarized distribution of the image originating from synchrotron radiations of the charged point particle in curved spacetime has been investigated in [19,20]. Moreover, the polarized image of a Schwarzschild black hole with a thin accretion disk has been researched under the interaction between electromagnetic field and Weyl tensor [21].…”

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

Cited by 39 publications

References 38 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

Multi-level images around Kerr-Newman black holes

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

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