Photon emissions from near-horizon extremal and near-extremal Kerr equatorial emitters
arXiv:2108.09051 · doi:10.1103/PhysRevD.104.124005
Abstract
We consider isotropic and monochromatic photon emissions from equatorial emitters moving along future-directed timelike geodesics in the near-horizon extremal Kerr (NHEK) and near-horizon near-extremal Kerr (near-NHEK) regions, to asymptotic infinity. We obtain numerical results for the photon escaping probability (PEP) and derive analytical expressions for the maximum observable blueshift (MOB) of the escaping photons, both depending on the emission radius and the emitter's proper motion. In particular, we find that for all anti-plunging or deflecting emitters that can eventually reach to asymptotic infinity, the PEP is greater than while for all plunging emitters the PEP is less than , and for the bounded emitters in the (near-)NHEK region, the PEP is always less than . In addition, for the emitters on unstable circular orbits in the near-NHEK region, the PEP decreases from to as the orbital radius decreases from the one of the innermost stable circular orbit to the one of the horizon. Furthermore, we show how the orientation of the emitter's motion along the radial or azimuthal direction affects the PEP and the MOB of the emitted photons.
arXiv commentSlight change in title, matched the published version in PRD
References in corpus (36)
- First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
- First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
- Black Hole Shadows, Photon Rings, and Lensing Rings
- Kerr Black Holes as Particle Accelerators to Arbitrarily High Energy
- The Extreme Kerr Throat Geometry: A Vacuum Analog of AdS_2 x S^2
- Universal Interferometric Signatures of a Black Hole's Photon Ring
- Stationary black holes and light rings
- The Shape of the Black Hole Photon Ring: A Precise Test of Strong-Field General Relativity
- Black Hole Superradiance From Kerr/CFT
- Influence of Quantum Correction on the Black Hole Shadows, Photon Rings and Lensing Rings
- Universal Polarimetric Signatures of the Black Hole Photon Ring
- Revised upper limit to energy extraction from a Kerr black hole
- Universal Properties of Light Rings for Stationary Axisymmetric Spacetimes
- Observational Signature of High Spin at the Event Horizon Telescope
- Observational signature of near-extremal Kerr-like black holes in a modified gravity theory at the Event Horizon Telescope
- Ultra-high-energy debris from the collisional Penrose process
- Influence of a plasma on the observational signature of a high-spin Kerr black hole
- Particle on the Innermost Stable Circular Orbit of a Rapidly Spinning Black Hole
- Gravity Waves from Extreme-Mass-Ratio Plunges into Kerr Black Holes
- Particle motion near high-spin black holes
- Kerr black holes as accelerators of spinning test particles
- Charged spinning black holes as accelerators of spinning particles
- The light ring and the appearance of matter accreted by black holes
- Observational signature of a near-extremal Kerr-Sen black hole in the heterotic string theory
- Gravitational waves from plunges into Gargantua
- Maximum Observable Blueshift from Circular Equatorial Kerr Orbiters
- Escape probability of a photon emitted near the black hole horizon
- Near-horizon geodesics of high-spin black holes
- Photon Emission from Circular Equatorial Kerr Orbiters
- Observability of the innermost stable circular orbit in a near-extremal Kerr black hole
- Emissions of photons near the horizons of Kerr-Sen black holes
- Escape probability of particle from Kerr-Sen black hole
- Photon emission from inside the innermost stable circular orbit
- Observability of Zero-angular-momentum Sources Near Kerr Black Holes
- Force-free magnetosphere attractors for near-horizon extreme and near-extreme limits of Kerr black hole
- Electro-Magnetic Energy Extraction from Rotating Black Holes in AdS