Analytical study of higher-order ring images of accretion disk around black hole

Bisnovatyi-Kogan, Gennady S.; Tsupko, Oleg Yu.

doi:10.48550/arxiv.2201.01716

Cited by 8 publications

(11 citation statements)

References 52 publications

(114 reference statements)

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“…In the geometrically thin disk setting, this produces a infinite sequence of concentric rings from photons that have completed n half-orbits in their approach to the critical curve. However, since the impact parameter window allowing a certain number of half-orbits is quickly diminished, the contribution of successive orbits to the total luminosity is generically expected to be strongly suppressed (see [68] for a general discussion). From a practical point of view, therefore, the relevant contributions to the total luminosity on the observer's screen will be provided by three types of trajectories:…”

Section: Ray-tracingmentioning

confidence: 99%

Light ring images of double photon spheres in black hole and wormhole space-times

Guerrero,

Olmo,

Rubiera-Garcia

et al. 2022

Preprint

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Section: Ray-tracingmentioning

confidence: 99%

Light ring images of double photon spheres in black hole and wormhole space-times

Guerrero,

Olmo,

Rubiera-Garcia

et al. 2022

Preprint

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“…In the TSL geometry (36) the ISCO equation ( 7) becomes very complicated, hence we solve it numerically as shown in Fig. 3.…”

Section: B Tsl Geometrymentioning

confidence: 99%

“…Using shadows, one can extract the information about the object's mass, rotation parameter, electric charge [16][17][18], non-Kerr distortion parameters [19,20], the presence of scalar hair [21][22][23][24], thermodynamics [25], dark matter [26]. Hypothetical ultra-compact objects (UCO) such as wormholes, regular black holes [27], gravastars or naked singularities can be distinguished from each other by their shadows [28][29][30][31], especially in the presence of luminous accretion disks [18,22,[32][33][34][35][36][37]. These perspectives have strongly stimulated the development of new methods for visualizing the shadows of black holes, both analytical and numerical.…”

Section: Introductionmentioning

confidence: 99%

Photon surfaces, shadows and accretion disks in gravity with minimally coupled scalar field

Bogush,

Gal'tsov,

Gyulchev

et al. 2022

Preprint

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In this article, we conduct a sequential study of possible observable images of black hole simulators described by two recently obtained rotating geometries in Einstein gravity, minimally coupled to a scalar field. One of them, "Kerr-like" (KL), can be seen as a legitimate alternative to the rotating Fisher-Janis-Newman-Winicour (FJNW) solution, and the other (TSL) is a scalar generalization of the Tomimatsu-Sato solution. Unlike the previous version of the rotating FJNW, these solutions do indeed satisfy the system's equations of motion. Our study includes both analytical and numerical calculations of equatorial circular orbits, photon regions, gravitational shadows, and radiation from thin accretion disks for various values of the object's angular momentum and scalar charge. The TSL solution was found to simulate Kerr for all valid parameter values with high accuracy. The maximum difference between the deviations of shadows from a circle for the Kerr and TSL cases does not exceed 1% and fits into the experimental observational data M87 * . However, near-extreme objects show two times smaller peak values of the observed outflow luminosity of the accretion disk than for the Kerr black hole. The KL solution cannot be ruled out by the experimental data for small values of the scalar charge either. As the scalar charge increases, the optical properties change dramatically. The shadow can become multiply connected, strongly oblate, and the photon region does not hide the singularity, so it should be classified as a strong singularity.

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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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Analytical study of higher-order ring images of accretion disk around black hole

Cited by 8 publications

References 52 publications

Light ring images of double photon spheres in black hole and wormhole space-times

Light ring images of double photon spheres in black hole and wormhole space-times

Photon surfaces, shadows and accretion disks in gravity with minimally coupled scalar field

Multi-level images around Kerr-Newman black holes

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