Photon Ring Interferometric Signatures Beyond The Universal Regime

Abstract

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. We apply our method to images ray traced from general-relativistic magnetohydrodynamic (GRMHD) simulations and demonstrate that incorporating the higher-order corrections is crucial for accurately modeling the visibility of the first photon ring around M87*.

10+6 pages, 7+3 figures, to be submitted

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Cited by in corpus (6)

• The Black Hole Explorer: Motivation and Vision
• Near-Horizon Polarization as a Diagnostic of Black Hole Spacetime
• Black hole photon ring beyond General Relativity: an integrable parametrization
• Spacetime Measurements with the Photon Ring
• Photon ring polarimetry with next-generation black hole imaging I. M87*
• Extreme-Lensing Signatures Revealed by Correlations of Simulated Black-Hole Movies