Investigating the mixing between two black hole populations in LIGO-Virgo-KAGRA GWTC-3

Ho, Ming-Feng; Perkins, Scott E.; Bird, Simeon; Dawson, William A.; Golovich, Nathan; Lu, Jessica R.; McGill, Peter

doi:10.1103/physrevd.110.063031

Title: Investigating the mixing between two black hole populations in LIGO-Virgo-KAGRA GWTC-3

Journal Article · 17 September 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.110.063031 · OSTI ID:2472517

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^[2]; Golovich, Nathan ^[2];

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University of California, Riverside, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of California, Berkeley, CA (United States)

Here, we introduce a population model to analyze the mixing between hypothesised power-law and ~ 35M_⊙ Gaussian bump black hole populations in the latest gravitational wave catalog, GWTC 3, estimating their co-location and separation. We find a relatively low level of mixing, $$3.1^{+5.0}_{-3.1}$$%, between the power-law and Gaussian populations, compared to the percentage of mergers containing two Gaussian bump black holes, $$5.0^{+3.2}_{-1.7}$$%. Our analysis indicates that black holes within the Gaussian bump are generally separate from the power-law population, with only a minor fraction engaging in mixing and contributing to the $$\mathcal{M}$$ ~ 14M_⊙ peak in the chirp mass. This leads us to identify a distinct population of Binary Gaussian Black Holes (BGBHs) that arise from mergers within the Gaussian bump. We suggest that current theories for the formation of the massive 35M_⊙ Gaussian bump population may need to reevaluate the underlying mechanisms that drive the preference for BGBHs.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); National Institutes of Health (NIH)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2472517

Report Number(s):: LLNL--JRNL-862034; 1094530

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 6 Vol. 110; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Investigating the mixing between two black hole populations in LIGO-Virgo-KAGRA GWTC-3

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