Frequency-domain analysis of black-hole ringdowns

We propose a novel, frequency-domain approach to the analysis of gravitational-wave ringdown signal binary black holes and identification quasinormal mode frequencies remnant. Our avoids issues spectral leakage that would normally be expected (associated with abrupt start ringdown) by modeling inspiral merger parts using flexible sum sine-Gaussian wavelets truncated at onset ringdown. Performing in frequency domain allows us use standard (and now well-established) Bayesian inference pipelines for data as well giving ability readily search over sky position time, although we find it is necessary an informative prior latter. test our method analyze several simulated signals varying signal-to-noise ratios injected into two- three-detector networks. generally able place tighter constraints on remnant black-hole mass spin than time-domain analysis.