Measurement of the Kerr spin parameter by observation of a compact object’s shadow
Kenta HiokiDepartment of Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555, JapanKei-ichi MaedaDepartment of Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555, Japan
2009en
ABI
Аннотация
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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