The final phase of a black hole merger where the newly formed black hole oscillates and settles into its final stable state, emitting characteristic gravitational waves that decay exponentially. These oscillations are like the ringing of a bell that gradually fades away.
Compound word from 'ring' (Old English 'hring') and 'down' (Old English 'dūne'), coined in gravitational wave physics to describe the decaying oscillations. The term emerged in the 1970s from black hole perturbation theory developed by scientists like Saul Teukolsky.
The ringdown phase is like a cosmic fingerprint—each black hole 'rings' at specific frequencies determined only by its mass and spin, allowing us to measure these properties with incredible precision! It's the universe's way of telling us exactly what kind of black hole was just born.
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