Probing Black Hole Spins with Horizon-Scale Images

Dear Colleagues,

Horizon-scale images of black holes have opened a new observational window for directly probing black hole properties, including spin. This sub-issue brings together contributions demonstrating how interferometric images of horizon-scale structures and polarimetric signatures encode information about the underlying spacetime parameters. By integrating millimeter-wave imaging with theoretical models of jet launching, disk dynamics, and radiative transfer, this collection explores the complementarity between very long baseline interferometric images and other spin diagnostics. Collectively, these works situate horizon-scale observations within the broader context of multimessenger astrophysics, providing benchmarks and best practices for interpreting black hole images alongside X-ray and gravitational-wave measurements and outlining a roadmap for the next generation of horizon-scale imaging efforts.

Dr. George Wong
Guest Editor

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