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October 20, 2025Open Access

Interferometric inference of black hole spin from photon ring size and brightness

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Authors

JFJoseph FarahALAlexandru LupsascaEQEliot Quataert

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Overview

New interferometric observable assesses black hole spin from photon ring size and brightness, suggesting precise measurements are possible.

Key Points

  • Interferometric measurements can effectively constrain black hole spin with a known mass-to-distance ratio.
  • The azimuthal intensity profile of the photon ring changes based on astrophysical source details.
  • The photon ring width is weakly sensitive to astrophysical variations, aiding in spin measurement precision.
  • Results support anticipated photon-ring-based methods for measuring black hole characteristics with the BHEX project.

Cite This Study

Farah et al. (2025) studied this question.

synapsesocial.com/papers/68f6379bb481a140a36cf4aehttps://doi.org/10.48550/arxiv.2509.23628
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