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Photon Ring Astrometry. I. A Simple Spin Measurement Technique for High-resolution Images of M87*

  • Authors: Delilah E. A. Gates, Dominic O. Chang, Aaron Held, Daniel C. M. Palumbo

Delilah E. A. Gates et al 2026 The Astrophysical Journal 1007 .

  • Provider: AAS Journals

Caption: Figure 2.

Feasibility regions in which fixed shift values {0.01, 0.02, …, 0.16} (colored region) can be achieved. The normalized parallel shift S∥ is marginalized over all spins 0 ≤ a* ≤ 1 (left); the normalized transverse shift S⊥ is marginalized over source radii 2 ≤ rs/rg ≤ 10 (right).

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