# Ain't No Mountain High Enough: Semi-Parametric Modeling of LIGO-Virgos Binary Black Hole Mass Distribution

@inproceedings{Edelman2021AintNM, title={Ain't No Mountain High Enough: Semi-Parametric Modeling of LIGO-Virgos Binary Black Hole Mass Distribution}, author={B Edelman and Zoheyr Doctor and Jaxen Godfrey and Benjamin Farr}, year={2021} }

We introduce a semi-parametric model for the primary mass distribution of binary black holes (BBHs) observed with gravitational waves (GWs) that applies a cubic-spline perturbation to a power law. We apply this model to the 46 BBHs included in the second gravitational wave transient catalog (GWTC2). The spline perturbation model recovers a consistent primary mass distribution with previous results, corroborating the existence of a peak at 35M (> 97% credibility) found with the Powerlaw+Peak… Expand

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We show the results for spline models with σ knot = 1 and 10 (purple), 15 (blue) and 20 (orange) nodes. The median and 90% credible intervals

- Corner plot that shows the posterior distribution on the power law slope, α, and the height of the perturbation function, f (m1), sliced at the three masses of most significant deviation: 7.5 M , 10 M , and 35 M