Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 475, Issue 3, Pages 3829-3853Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty039
Keywords
black hole physics; gravitational lensing: strong
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Funding
- NSF [1205550, 1506027]
- John Templeton Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506027] Funding Source: National Science Foundation
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We analytically compute the observational appearance of an isotropically emitting point source on a circular, equatorial orbit near the horizon of a rapidly spinning black hole. The primary image moves on a vertical line segment, in contrast to the primarily horizontal motion of the spinless case. Secondary images, also on the vertical line, display a rich caustic structure. If detected, this unique signature could serve as a 'smoking gun' for a high spin black hole in nature.
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