Photon Emission from Circular Equatorial Orbiters around Kerr Black Holes Speaker(s): Delilah Gates
Abstract:
We consider monochromatic and isotropic photon emission from circular equatorial Kerr orbiters. We calculate the critical curve delineating the region of photon escape from that of photon capture in each emitterâ€™s sky, allowing us to derive analytic expressions for the photon escape probability and the redshiftdependent total flux collected on the celestial sphere as a function of emission radius and black hole parameters. This critical curve generalizes to finite orbital radius the usual Kerr critical curve and displays interesting features in the limit of high spin. These results confirm that the nearhorizon geometry of a highspin black hole is in principle observable. Date: 17/12/2020  1:00 pm
Series: Strong Gravity
