Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow

Details Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow

2009-04-23

arxiv.org/abs/0904.3575v3

Phys.Rev.D80:024042,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, 11 figures; v2: references added, typos corrected; v3: accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.80.024042

A black hole casts a shadow as an optical appearance because of its strong gravitational field. We study how to determine the spin parameter and the inclination angle by observing the apparent shape of the shadow, which is distorted mainly by those two parameters. Defining some observables characterizing the apparent shape (its radius and distortion parameter), we find that the spin parameter and inclination angle of a Kerr black hole can be determined by the observation. This technique is also extended to the case of a Kerr naked singularity.

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