Black hole mimicker hiding in the shadow: Optical properties of the $\gamma$-metric

Abstract

Can the observation of the "shadow" allow us to distinguish a black hole from a more exotic compact object? We study the motion of photons in a class of vacuum static axially-symmetric space-times that is continuously linked to the Schwarzschild metric through the value of one parameter that can be interpreted as a measure of the deformation of the source. We investigate the lensing effect and shadow produced by the source with the aim of comparing the expected image with the shadow of a Schwarzschild black hole. In the context of astrophysical black holes we found that it may not be possible to distinguish an exotic source with small deformation parameter from a black hole. However, as the deformation increases noticeable effects arise. Therefore, the future more precise measurement of the shadow of astrophysical black hole candidates would in principle allow to put constraints on the deviation of the object from spherical symmetry.

arXiv comment12 pages, 7 figures. v3: refereed version

References in corpus (68)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• Testing General Relativity with Present and Future Astrophysical Observations
• SparsePak: A Formatted Fiber Field Unit for The WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration
• Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
• Shadows of Kerr black holes with scalar hair
• Gravitational Wave Tests of General Relativity with Ground-Based Detectors and Pulsar Timing Arrays
• Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
• Shadow of rotating regular black holes
• The observational evidence for horizons: from echoes to precision gravitational-wave physics
• A Metric for Rapidly Spinning Black Holes Suitable for Strong-Field Tests of the No-Hair Theorem
• Tests for the existence of horizons through gravitational wave echoes
• A new method for shadow calculations: application to parameterised axisymmetric black holes
• Apparent shape of super-spinning black holes
• Shadow of a rotating braneworld black hole
• Observing the shadow of Einstein-Maxwell-Dilaton-Axion black hole
• Testing black hole candidates with electromagnetic radiation
• Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
• The Current Ability to Test Theories of Gravity with Black Hole Shadows
• Shadows of spherically symmetric black holes and naked singularities
• General parametrization of axisymmetric black holes in metric theories of gravity
• Shadow of a Kaluza-Klein rotating dilaton black hole
• Optical properties of black hole in the presence of plasma: shadow
• Testing the black hole "no-hair" hypothesis
• A coordinate-independent characterization of a black hole shadow
• Constraining the spin and the deformation parameters from the black hole shadow
• Shadow of Kerr-Taub-NUT black hole
• Black Hole Based Tests of General Relativity
• Wormhole Shadows
• Light propagation in a plasma on Kerr spacetime: Separation of the Hamilton-Jacobi equation and calculation of the shadow
• Phenomenological aspects of black holes beyond general relativity
• Optical phenomena in brany Kerr spacetimes
• Photon Regions and Shadows of Accelerated Black Holes
• BlackHoleCam: fundamental physics of the Galactic center
• The effect of the Brane-Dicke coupling parameter on weak gravitational lensing by wormholes and naked singularities
• Appearance of Keplerian discs orbiting Kerr superspinars
• Gravitational Lensing in presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow
• Non-singular quantum-inspired gravitational collapse
• Shape and position of the shadow in the $\delta =2$ Tomimatsu-Sato space-time
• Circular geodesics and accretion disks in Janis-Newman-Winicour and Gamma metric
• Classical collapse to black holes and quantum bounces: A review
• Weak Gravitational lensing by phantom black holes and phantom wormholes using the Gauss-Bonnet theorem
• Profiles of emission lines generated by rings orbiting braneworld Kerr black holes
• Black Hole Shadows of Charged Spinning Black Holes
• A Ray-Tracing Algorithm for Spinning Compact Object Spacetimes with Arbitrary Quadrupole Moments. I. Quasi-Kerr Black Holes
• Understanding photon sphere and black hole shadow in dynamically evolving spacetimes
• Shadow cast by rotating braneworld black holes with a cosmological constant
• Testing the no-hair theorem with the continuum-fitting and the iron line methods: a short review
• Tests of General Relativity in the Strong Gravity Regime Based on X-Ray Spectropolarimetric Observations of Black Holes in X-Ray Binaries
• Deflection angle of photon through dark matter by black holes and wormholes using the Gauss-Bonnet theorem
• K$\alpha$ iron line profile from accretion disks around regular and singular exotic compact objects
• Motion of test particles in the field of a naked singularity
• Charged particle motion and electromagnetic field in $\gamma$ spacetime
• Black Hole Shadow as a Test of General Relativity: Quadratic Gravity
• Constraints on the spacetime metric around seven "bare" AGNs using X-ray reflection spectroscopy
• Shadows of CPR black holes and tests of the Kerr metric
• Optical effects related to Keplerian discs orbiting Kehagias-Sfetsos naked singularities
• Mass Quadrupole as a Source of Naked Singularities
• Non-spherical sources of static gravitational fields: investigating the boundaries of the no-hair theorem
• The Levi-Civita spacetime as a limiting case of the Gamma spacetime
• Black hole shadows in fourth-order conformal Weyl gravity
• Axially symmetric and static solutions of Einstein equations with self-gravitating scalar field
• Difficulties of Quantitative Tests of the Kerr-Hypothesis with X-Ray Observations of Mass Accreting Black Holes
• Observing the Shadows of Stellar-Mass Black Holes with Binary Companions
• Imaging black holes: past, present and future
• The Erez-Rosen metric and the role of the quadrupole on light propagation
• Quarks, Hadrons, and Emergent Spacetime
• Observational properties of rigidly rotating dust configurations

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• Observational appearance of Kaluza-Klein black holes
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• Photon surfaces, shadows and accretion disks in gravity with minimally coupled scalar field
• Optical appearance of regularized compact objects without an exterior photon sphere
• Luminosity of accretion disks in compact objects with quadrupole
• A Generalized Class of Taub-NUT-Scalar Metrics
• Quasinormal spectra of a wormhole family: overtone features and a parameter-controlled redshift
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• Visible shapes of black holes M87* and SgrA*