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2020

Measuring the shape of a black hole photon ring

Gralla, Samuel E.

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General relativity predicts that gravitational lensing near black holes will produce narrow "photon rings" on images.

Building on recent work of Johnson, Lupsasca et al.
focusing on circular rings, I calculate the long-baseline interferometric signature of a narrow feature of arbitrary shape and intensity.
The shape information is contained in the oscillation frequencies of the complex visibility as a function of baseline length, for each baseline angle.

Measuring the shape of a black hole photon ring · Around

Built on

S. E. Gralla, D. E. Holz, and R. M. Wald, “Black hole shadows, photon rings, and lensing rings,” Phys. Rev. D 100
Original
1906
Earlier work this paper cites.
S. E. Gralla and A. Lupsasca, “Lensing by Kerr black holes,” Phys. Rev. D 101
Original
1910
Earlier work this paper cites.
T. Johannsen and D. Psaltis, “Testing the No-hair Theorem with Observations in the Electromagnetic Spectrum. II. Black Hole Images,” ApJ 718
Original
1931
Earlier work this paper cites.

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J.-P. Luminet, “Image of a spherical black hole with thin accretion disk,” A&A 75
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C.-k. Chan, D. Psaltis, and F. Özel, “GRay: A Massively Parallel GPU-based Code for Ray Tracing in Relativistic Spacetimes,” ApJ 777
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2013
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S. E. Gralla and A. Lupsasca, “On the Observable Shape of Black Hole Photon rings.” appearing today
Cited in the paper.

Then

S. E. Gralla, A. Lupsasca, and A. Strominger, “Observational signature of high spin at the Event Horizon Telescope,” MNRAS 475
Original
2018
Later among the works it cites.
M. D. Johnson, A. Lupsasca, A. Strominger, G. N. Wong, S. Hadar, D. Kapec, R. Narayan, A. Chael, C. F. Gammie, P. Galison, D. C. M. Palumbo, S. S. Doeleman, L. Blackburn, M. Wielgus, D. W. Pesce, J. R. Farah, and J. M. Moran, “Universal interferometric signatures of a black hole’s photon ring,” Science Advances
2020
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