Figure 15: The time evolution of the accretion/collapse of a quadrupolar shell onto a Schwarzschild
black hole. The left panel shows isodensity contours and the right panel the associated gravitational
waveform. The shell, initially centered at , is gradually accreted by the black hole, a
process that perturbs the black hole and triggers the emission of gravitational radiation. After the
burst, the remaining evolution shows the decay of the black-hole quasinormal-mode ringing. By the
end of the simulation a spherical accretion solution is reached. Further details are given in [310].
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