Fig. 1

Equilibrium on the Eddington capture sphere. Trajectories of particles returning to the Eddington sphere (X = 5, k = 1.5) are shown for four initial velocity perturbations: vφ ≡ xdφ/dτ = 0.12,vr ≡ dx/dτ = 0 (thick green continuous line), vφ = 0.20,vr = 0 (thin blue continuous line), vφ = 0.12,vr = 0.10 (thick red dashed line) and vφ = 0.12,vr = −0.10 (extra thick violet dashed line). Also shown is a tangential escape trajectory (in thick brown) with initial vφ = 0.32,vr = 0.
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