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Search for Eccentric Black Hole Coalescences during the Third Observing Run of LIGO and Virgo
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Search for Eccentric Black Hole Coalescences during the Third Observing Run of LIGO and Virgo

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration, A. G Abac, R Abbott, H Abe, F Acernese, K Ackley, C Adamcewicz, S Adhicary, …
07/08/2023
DOI: https://doi.org/10.48550/arxiv.2308.03822

摘要

Physics - High Energy Astrophysical Phenomena
Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total massM>70M_(⊙) ) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities0 < e ≤ 0.3at0.33Gpc ⁻³yr ⁻¹at 90% confidence level.

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