Observational signatures of strongly naked singularities: image of the thin accretion disk

Abstract

We study the optical appearance of a thin accretion disk around the strongly naked static Janis-Newman-Winicour singularity. The solution does not possess a photon sphere, which results in the formation of a complex structure of bright rings in the central region of the disk image. Such structure is absent in the case of the Schwarzschild black hole with a thin accretion disk, where instead of the image we observe the black hole shadow. Some of the rings emit with the maximal observable radiation flux from the accretion disk, and should be experimentally detectable. Thus, this qualitatively new feature can be used to distinguish observationally black holes from naked singularities. We elucidate the appearance of the ring structure by revealing the physical mechanism of its formation, and explaining the nature of each of the ring images. We make the conjecture that a similar structure would also appear for other solutions without a photon sphere and it can serve as a general observational signature for distinguishing compact objects possessing no photon sphere from black holes.

arXiv comment30 pages

References in corpus (37)

• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• Shadows of Kerr black holes with scalar hair
• Time delay and magnification centroid due to gravitational lensing by black holes and naked singularities
• Shadow of a rotating braneworld black hole
• Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
• Shadows of spherically symmetric black holes and naked singularities
• Shadow of five-dimensional rotating Myers-Perry black hole
• Shadow of a Kaluza-Klein rotating dilaton black hole
• Shadows of Einstein-dilaton-Gauss-Bonnet black holes
• The Shadow of a Rotating Traversable Wormhole
• Thin accretion disks in stationary axisymmetric wormhole spacetimes
• Wormhole Shadows
• Chaotic lensing around boson stars and Kerr black holes with scalar hair
• Shadows of Kerr black holes with and without scalar hair
• Shadows of rotating wormholes
• Janis-Newman-Winicour and Wyman solutions are the same
• Incidences between points and lines on a two-dimensional variety
• Modified Gravity Black Holes and their Observable Shadows
• Shadows of Multi-Black Holes: Analytic Exploration
• Circular geodesics and accretion disks in Janis-Newman-Winicour and Gamma metric
• Weak Gravitational lensing by phantom black holes and phantom wormholes using the Gauss-Bonnet theorem
• Gravastar Shadows
• Image of the Janis-Newman-Winicour naked singularity with a thin accretion disk
• Gravitational Lensing by Rotating Naked Singularities
• Can we distinguish black holes from naked singularities by the images of their accretion disks?
• On the shadow of rotating traversable wormholes
• What does a binary black hole merger look like?
• Binary black hole shadows, chaotic scattering and the Cantor set
• Uniqueness of photon spheres in electro-vacuum spacetimes
• Distinguishing rotating naked singularities from Kerr-like wormholes by their deflection angles of massive particles
• Shadows of Colliding Black Holes
• Wormhole Shadows in Rotating Dust
• Uniqueness of the static Einstein-Maxwell spacetimes with a photon sphere
• Classification of the static and asymptotically flat Einstein-Maxwell-dilaton spacetimes with a photon sphere
• Multiple shadows from distorted static black holes
• Interactive visualization of a thin disc around a Schwarzschild black hole
• Can we identify massless braneworld black holes by observations?

Cited by in corpus (31)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Distortions of images of Schwarzschild lensing
• The shadows and observational appearance of a noncommutative black hole surrounded by various profiles of accretions
• Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes
• Light Ring behind Wormhole Throat: Geodesics, Images and Shadows
• Conservation of distortion of gravitationally lensed images
• Thin accretion discs around spherically symmetric configurations with nonlinear scalar fields
• Horizonless spacetimes as seen by present and next-generation Event Horizon Telescope arrays
• Image of the Kerr-Newman black hole surrounded by a thin accretion disk
• Spherical photon orbits around a rotating black hole with quintessence and cloud of strings
• Exploring Nonlinear Electrodynamics Theories: Shadows of Regular Black Holes and Horizonless Ultra-Compact Objects
• Globally visible singularity in an astrophysical setup
• Thin accretion disks around a black hole in Einstein-Aether-scalar theory
• Imaging ultra-compact objects with radiatively inefficient accretion flows
• Study of relativistic accretion flow around KTN black hole with shocks
• Shadows and rings of a de Sitter-Schwarzschild black hole
• Singularities in static spherically symmetric configurations of General Relativity with strongly nonlinear scalar fields
• Collapsing scenario for the k-essence emergent generalised Vaidya spacetime in the context of massive gravity's rainbow
• Imaging a semi-classical horizonless compact object with strong redshift
• Accretion flows around exotic tidal wormholes I. Ray-tracing
• Gravitational lensing and accretion disk imaging of a Buchdahl dense core
• Synchrotron emitting Komissarov torus around naked singularities
• Shadow and thin accretion disk around Ayón-Beato-García black hole coupled with cloud of strings
• Observational properties of black hole in quantum fluctuation modified gravity
• Observational properties of a Schwarzschild black hole surrounded by a Dehnen-type dark matter halo
• Photon surfaces, shadows and accretion disks in gravity with minimally coupled scalar field
• Image of the thin accretion disk around compact objects in the Einstein-Gauss-Bonnet gravity
• Images of the accretion disk in Hybrid metric-Palatini gravity
• Signatures of the Israel Junction II: Double Photon Rings in Slowly Rotating Kerr Spacetime with Thin Shell
• Images and photon regions of continuous photon sphere spacetime
• Multi-ring images of thin accretion disk of a regular naked compact object