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2024

Photon Ring Interferometric Signatures Beyond The Universal Regime

Jia, He, Quataert, Eliot, Lupsasca, Alexandru et al.

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We calculate the interferometric signatures of black hole photon rings beyond the universal regime by perturbatively including the effects of finite ring width.

Our approach first slices a thick ring into a series of thin rings, each of which falls within the universal regime.
We thus calculate the visibility of the thick ring by aggregating the contributions from each thin ring, and then perturbatively expand the result into polynomials of the baseline length $u$.
We show that the visibility amplitude of a thick ring depends on its "center-of-light" diameter; it also includes additional higher-order corrections due to the width of the ring, with the leading correction terms proportional to $u^2$ for the envelope and $u^3$ for the phase.

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H. Paugnat, A. Lupsasca, F. Vincent, and M. Wielgus, arXiv e-prints , arXiv:2206.02781 (2022), arXiv:2206.02781 [astro-ph.HE]
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