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Time-frequency analysis of extreme-mass-ratio inspiral signals in mock LISA data
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Extreme-mass-ratio inspirals (EMRIs) of ~ 1-10 solar-mass compact objects into ~ million solar-mass massive black holes can serve as excellent probes of strong-field general relativity. The Laser Interferometer Space Antenna (LISA) is expected to detect gravitational wave signals from apprxomiately one hundred EMRIs per year, but the data analysis of EMRI signals poses a unique set of challenges due to their long duration and the extensive parameter space of possible signals. One possible approach is to carry out a search for EMRI tracks in the time-frequency domain. We have applied a time-frequency search to the data from the Mock LISA Data Challenge (MLDC) with promising results. Our analysis used the Hierarchical Algorithm for Clusters and Ridges to identify tracks in the time-frequency spectrogram corresponding to EMRI sources. We then estimated the EMRI source parameters from these tracks. In these proceedings, we discuss the results of this analysis of the MLDC round 1.3 data.
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Time-frequency Imprints of Extreme Mass-Ratio Inspirals in Confusion Gravitational Wave Background
Correlations of time-frequency spectra can measure EMRI population parameters to a few percent accuracy even when the EMRI gravitational wave background is two orders of magnitude weaker than the white dwarf foreground.
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