What Regions Surround a Black Hole?

How do the horizon, disk, corona, and photon region differ?

You distinguished the event horizon, photon region, accretion disk, and corona; identified which structures radiate; and kept observation, relativistic inference, and unresolved corona geometry separate.

An artistic reconstruction of a black hole with a lensed orange accretion disk and a pale blue hot corona above the inner flow. — Vastward artistic reconstruction. The glowing disk and pale blue corona represent matter outside the event horizon; their apparent shape is altered by gravitational lensing. This generated image is not a direct observation or a scale drawing.

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