Optical images of the Kerr-Sen black hole and thin accretion disk

Abstract

This paper investigates the observable properties of a Kerr-Sen black hole surrounded by a thin accretion disk, focusing on the impact of the black hole's spin and charge on the image. Using ray-tracing techniques, we conduct a detailed analysis of the black hole's image, redshift distribution, and intensity distributions at different observation frequencies. The results demonstrate that spin has a more significant effect on the distortion of the inner shadow than charge, and the observer's inclination angle plays a critical role in shaping the redshift distribution, especially near the innermost stable circular orbit. Additionally, the intensity is found to be higher at 86 GHz than at 230 GHz. This study highlights the crucial role of the accretion disk's geometry in determining the black hole's image and redshift effects, thereby providing a refined theoretical framework to guide future observational efforts targeting the Kerr-Sen black hole and its electromagnetic signals.

34 pages, 30 figures

References in corpus (25)

• 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. III. Data Processing and Calibration
• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• Black Hole Shadows, Photon Rings, and Lensing Rings
• First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
• The Shadow of a Spherically Accreting Black Hole
• Lensing by Kerr Black Holes
• Observing the Inner Shadow of a Black Hole: A Direct View of the Event Horizon
• Image of Kerr-Melvin black hole with thin accretion disk
• The Polarized Image of a Synchrotron Emitting Ring of Gas Orbiting a Black Hole
• Photon ring test of the Kerr hypothesis: Variation in the ring shape
• The merger fraction of post-starburst galaxies in UNIONS
• Shape of higher-order images of equatorial emission rings around a Schwarzschild black hole: Analytical description with polar curves
• First light observations of the solar wind in the outer corona with the Metis coronagraph
• Observational Signatures of Frame Dragging in Strong Gravity
• Images of hairy Reissner-Nordström black hole illuminated by static accretions
• Multi-level images around Kerr-Newman black holes
• Image of the Kerr-Newman black hole surrounded by a thin accretion disk
• Thin accretion disk and shadow of Kerr-Sen black hole in Einstein-Maxwell-dilaton-axion gravity
• Multipole moments of compact objects with NUT charge: Theoretical and observational implications
• Axial anomaly in nonlinear conformal electrodynamics
• Null geodesics in extremal Kerr-Newman black holes
• Shadow of Kerr black hole surrounded by a cloud of strings in Rastall gravity and constraints from M87*
• Domain walls and other defects in Eddington-inspired Born-Infeld gravity

Cited by in corpus (1)

• Images of the accretion disk in Hybrid metric-Palatini gravity