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Photon Orbit Signatures in Spectra of Black Hole Accretion Disks

  • Authors: Daniel C. M. Palumbo, George N. Wong, Angelo Ricarte

Daniel C. M. Palumbo et al 2025 The Astrophysical Journal Letters 994 .

  • Provider: AAS Journals

Caption: Figure 5.

Spectral feature in ray-traced GRMHD, corresponding to a MAD a = 0.5 Rhigh = 160 model of M87*. Left: total intensity map. Center: spectral index map at 230 GHz revealing the elevated spectral index in the photon ring. Right: instantaneous spectrum, where the gray vertical band demarcates 230–345 GHz, and a circle marks the maximum of each contribution.

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