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Astronomy

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  • $\begingroup$ The figure of $5r_s$ is wrong - it is $2.6r_s$ (unless you were referring to a diameter). But the OP knows this; they want to know why? $\endgroup$
    – ProfRob
    Commented Apr 12, 2019 at 14:58
  • $\begingroup$ The thing I think is at 5 ish radii is the point at which the accretion disk becomes unstable. This is, I think further out than the innermost stable orbit, because the disk is hot and turbulent. $\endgroup$
    – Steve Linton
    Commented Apr 12, 2019 at 15:21
  • $\begingroup$ The ring is seen at a radius of $\sqrt{27} GM/c^2$ for precise geometric reasons. $\endgroup$
    – ProfRob
    Commented Apr 12, 2019 at 16:42