Multi-level images around Kerr-Newman black holes

Hou, Yehui; Liu, Peng; Guo, Minyong; Yan, Hongping; Chen, Bin

doi:10.48550/arxiv.2203.02755

Cited by 3 publications

(3 citation statements)

References 34 publications

(60 reference statements)

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“…In 2019, the Event Horizon Telescope has been presented the shadow of supermassive black hole in the M87 galaxy [59][60][61][62][63][64][65][66][67] (see also recent results about Sgr A* [68][69][70][71][72][73]). After that, attention has been attracted to the study of higher-order photon rings which can be expected in a more detailed image, being concentrated near the edge of the black hole shadow [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92]. These rings are lensed images of the luminous matter surrounding the black hole.…”

Section: Introductionmentioning

confidence: 99%

Shape of higher-order images of equatorial emission rings around a Schwarzschild black hole: Analytical description with polar curves

Tsupko

2022

Phys. Rev. D

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Higher-order photon rings can be expected to be detected in a more detailed image of the black hole found in future observations. This rings are lensed images of the luminous matter surrounding the black hole and are formed by photons that loop around it. In this paper we have succeeded to derive an analytical expression for the shape of the higher-order rings in the form that is most convenient for application: the explicit equation of the curve in polar coordinates. The formula describes the apparent shape of the higher-order image of the circular orbit with the given radius around Schwarzschild black hole as viewed by distant observer with an arbitrary inclination. For the derivation, the strong deflection limit of the gravitational deflection is used. Our formula is a simple and efficient alternative to the numerical calculation of ray trajectories, with the main application to studying the shape of n = 2 and n = 3 photon rings.

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Section: Introductionmentioning

confidence: 99%

Shape of higher-order images of equatorial emission rings around a Schwarzschild black hole: Analytical description with polar curves

Tsupko

2022

Phys. Rev. D

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“…For the sake of their shadow images, discerning the nature of the background geometry via the disk's direct emission is subject to some limitations due to the still poorly understood physics of the plasma [38]. This makes the multiring structure, whose location and size are more dependent on the geometry of the space-time and less on the accretion disk physics (an effect more pronounced as more half-orbits are considered, i.e., as light rays approach closer to the critical curve), to play a more prominent role in testing such a geometry in a less astrophysical modeldependent way [39]. Therefore, a characterization of such a multiring structure in different geometries represents a promising avenue to test the strong-field regime of the gravitational interaction [40,41].…”

Section: Introductionmentioning

confidence: 99%

Multiring images of thin accretion disk of a regular naked compact object

et al. 2022

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We discuss the importance of multiring images in the optical appearance of a horizonless spherically symmetric compact object, when illuminated by an optically thin accretion disk. Such an object corresponds to a subcase of an analytically tractable extension of the Kerr solution dubbed as the "eye of the storm" by Simpson and Visser in [J. Cosmol. Astropart. Phys. 03 ( 2022) 011], which merits in removing curvature singularities via an asymptotically Minkowski core, while harboring both a critical curve and an infinite potential barrier at the center for null geodesics. This multiring structure is induced by light rays winding several times around the object, and whose luminosity is significantly boosted as compared to the Schwarzschild solution by the modified shape of the potential. Using three toy profiles for the emission of an infinitely thin disk, truncated at its inner edge (taking its maximum value there) and having different decays with the distance, we discuss the image created by up to eight rings superimposed on top of the direct emission of the disk as its edge is moved closer to the center of the object. Our results point to the existence of multiring images with a non-negligible luminosity in shadow observations when one allows for the existence of other compact objects in the cosmic zoo beyond the Schwarzschild solution. Such multiring images could be detectable within the future projects on very long baseline interferometry.

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“…For the sake of their shadow images, discerning the nature of the background geometry via the disk's direct emission is subject to some limitations due to the still poorly understood physics of the plasma [33]. This makes the multi-ring structure, whose location and size are more dependent on the geometry of the space-time and less on the accretion disk physics (an effect more pronounced as more half-orbits are considered, i.e., as light rays approach closer to the critical curve), to play a more prominent role in testing such a geometry in a less astrophysical model-dependent way [34]. Therefore, a characterization of such a multi-ring structure in different geometries represents a promising avenue to test the strong-field regime of the gravitational interaction [35].…”

Section: Introductionmentioning

confidence: 99%

Multi-ring images of thin accretion disk of a regular naked compact object

Guerrero,

Olmo,

Rubiera-Garcia

et al. 2022

Preprint

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We discuss the importance of multi-ring images in the optical appearance of a horizonless spherically symmetric compact object, when illuminated by an optically thin accretion disk. Such an object corresponds to a sub-case of an analytically tractable extension of the Kerr solution dubbed as the eye of the storm by Simpson and Visser in [JCAP 03 (2022) 011], which merits in removing curvature singularities via an asymptotically Minkowski core, while harbouring both a critical curve and an infinite potential barrier at the center for null geodesics. This multi-ring structure is induced by light rays winding several times around the object, and whose luminosity is significantly boosted as compared to the Schwarzschild solution by the modified shape of the potential. Using three toyprofiles for the emission of an infinitely thin disk, truncated at its inner edge (taking its maximum value there) and having different decays with the distance, we discuss the image created by up to eight rings superimposed on top of the direct emission of the disk as its edge is moved closer to the center of the object. Our results point out to the existence of multi-ring images with a non-negligible luminosity in shadow observations when one allows for the existence of other compact objects in the cosmic zoo beyond the Schwarzschild solution. Such multi-ring images could be detectable within the future projects on very-long baseline interferometry.

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Multi-level images around Kerr-Newman black holes

Cited by 3 publications

References 34 publications

Shape of higher-order images of equatorial emission rings around a Schwarzschild black hole: Analytical description with polar curves

Shape of higher-order images of equatorial emission rings around a Schwarzschild black hole: Analytical description with polar curves

Multiring images of thin accretion disk of a regular naked compact object

Multi-ring images of thin accretion disk of a regular naked compact object

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