Optical appearance of the Schwarzschild black hole in the string cloud context
arXiv:2305.00007 · doi:10.1088/1674-1137/accad5
Abstract
The image of a black hole (BH) consists of direct and secondary images that depend on the observer position. We investigate the optical appearance of a Schwarzschild BH in the context of a string cloud to reveal how the BH's observable characteristics are influenced by the inclination angle, string cloud parameter, and impact parameter. Following Luminet's work [Astron. Astrophys. 75, 228 (1979)], we adopt a semi-analytic method to calculate the total bending angle of the light ray and derive the direct and secondary images of the Schwarzschild string cloud BH. Our results show that an increase in the inclination angle leads to a more pronounced separation of the images. We consider the gravitational redshift and present the redshift distribution of the direct image while illustrating the flux distribution. We observe that the direct image exhibits blueshift and redshift simultaneously, and the asymmetry of the flux distribution increases with the inclination angle. Finally, we obtain the Schwarzschild string cloud BH image via a numerical simulation, which provides an approximate illustration of the EHT resolution.
10 pages, 7 figures
References in corpus (27)
- First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
- First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
- First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
- First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
- First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
- First M87 Event Horizon Telescope Results. II. Array and Instrumentation
- First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
- Observation of gravitational waves from two neutron star-black hole coalescences
- First Sagittarius A* Event Horizon Telescope Results. VI: Testing the Black Hole Metric
- Black Hole Shadows, Photon Rings, and Lensing Rings
- Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
- First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
- First Sagittarius A* Event Horizon Telescope Results. III: Imaging of the Galactic Center Supermassive Black Hole
- First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multi-wavelength Observations, Data Processing, and Calibration
- First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
- Deflection angle in the strong deflection limit in a general asymptotically flat, static, spherically symmetric spacetime
- Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field
- Weak and strong deflection gravitational lensings by a charged Horndeski black hole
- Formalism for testing theories of gravity using lensing by compact objects. III: Braneworld gravity
- Gravitational lensing by massless braneworld black holes
- QED and accretion flow models effect on optical appearance of Euler-Heisenberg black holes
- Influence of Accretion Flow and Magnetic Charge on the Observed Shadows and Rings of the Hayward Black Hole
- Thermodynamics of the Reissner-Nordström black hole with quintessence matter on the EGUP framework
- Thin accretion disks around traversable wormholes
- Thermodynamic stability and P-V criticality of nonsingular-AdS black holes endowed with clouds of strings
- Bardeen solution with a cloud of strings
- Critical behavior of AdS Gauss-Bonnet massive black holes in the presence of external string cloud