The ringdown of GW231123 contains a detectable 200 quasinormal mode in addition to the fundamental 220 mode, with log10 Bayes factor 5.3, and the inferred remnant mass and spin agree with general relativity.
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Detection of a Higher Harmonic Quasi-normal Mode in the Ringdown Signal of GW231123
The ringdown of GW231123 contains a detectable 200 quasinormal mode in addition to the fundamental 220 mode, with log10 Bayes factor 5.3, and the inferred remnant mass and spin agree with general relativity.