Divergence in mass ratio distributions between low-mass and high-mass coalescing binary black holes

Abstract

Coalescing binary black hole (BBH) systems are likely formed via several channels, and it is challenging to understand their formation / evolutionary processes. Some features in the mass function of the primary components ($m_1$), such as the distinct Gaussian-like peak located at $\sim 34M_{\odot }$, have been previously found. In this work, we investigate the possible dependence of the mass ratio ($q=m_2/m_1$) distribution on the primary mass. We find a Bayesian odds ratio of 18.1 in favor of divergence in the mass ratio distributions between the low- and high-mass ranges over an invariable mass ratio distribution. The BBHs with $m_1\gtrsim 29M_{\odot }$ have a stronger preference to be symmetric compared to those with $m_1\lesssim 29M_{\odot }$ at a 97.6\% credible level. Additionally, we find mild evidence that the BBHs with $m_1$ located in the Gaussian-like peak have a mass ratio distribution different from that of other BBHs. Our findings may be in favor of some formation channels, such as the chemically homogeneous evolution and the dynamical assembly in globular clusters/nuclear star clusters, which are more likely to provide symmetric BBHs in the high-mass range.

arXiv comment11 pages, 6 figures, 2 tables, published In ApJL

References in corpus (40)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• Binary Black Hole Population Properties Inferred from the First and Second Observing Runs of Advanced LIGO and Advanced Virgo
• GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses
• A new route towards merging massive black holes
• Binary Black Hole Mergers from Globular Clusters: Masses, Merger Rates, and the Impact of Stellar Evolution
• Merging binary black holes formed through chemically homogeneous evolution in short-period stellar binaries
• Double Compact Objects III: Gravitational Wave Detection Rates
• The chemically homogeneous evolutionary channel for binary black hole mergers: rates and properties of gravitational-wave events detectable by advanced LIGO
• The Effect of Pair-Instability Mass Loss on Black Hole Mergers
• One Channel to Rule Them All? Constraining the Origins of Binary Black Holes using Multiple Formation Pathways
• PyCBC Inference: A Python-based parameter estimation toolkit for compact binary coalescence signals
• Hierarchical mergers of stellar-mass black holes and their gravitational-wave signatures
• Rates of Compact Object Coalescences
• Black hole growth through hierarchical black hole mergers in dense star clusters: implications for gravitational wave detections
• Merging stellar-mass binary black holes
• GWTC-2.1: Deep Extended Catalog of Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• Determining the population properties of spinning black holes
• Stellar-mass black holes in young massive and open stellar clusters and their role in gravitational-wave generation
• Evidence for hierarchical black hole mergers in the second LIGO--Virgo gravitational-wave catalog
• The Cosmic Evolution of Binary Black Holes in Young, Globular and Nuclear Star Clusters: Rates, Masses, Spins and Mixing Fractions
• Mining Gravitational-wave Catalogs To Understand Binary Stellar Evolution: A New Hierarchical Bayesian Framework
• The Emergence of Structure in the Binary Black Hole Mass Distribution
• Building better spin models for merging binary black holes: Evidence for non-spinning and rapidly spinning nearly aligned sub-populations
• Picky Partners: The Pairing of Component Masses in Binary Black Hole Mergers
• Formation channels of single and binary stellar-mass black holes
• Exploring Features in the Binary Black Hole Population
• Relativistic mergers of black hole binaries have large, similar masses, low spins and are circular
• Ain't No Mountain High Enough: Semi-Parametric Modeling of LIGO-Virgos Binary Black Hole Mass Distribution
• The Deaths of Very Massive Stars
• Using final black hole spins and masses to infer the formation history of the observed population of gravitational wave sources
• Find the Gap: Black Hole Population Analysis with an Astrophysically Motivated Mass Function
• Probing Extremal Gravitational-Wave Events with Coarse-Grained Likelihoods
• A flexible Gaussian process reconstruction method and the mass function of the coalescing binary black hole systems
• Black Hole Mass Function of Coalescing Binary Black Hole Systems: Is There a Pulsational Pair Instability Mass Cutoff?
• Population properties of neutron stars in the coalescing compact binaries
• Mass and effective spin distributions of binary black hole events: Evidence for a population of hierarchical black hole mergers in active galactic nuclei disks
• Black Hole Gravitational Potential Enhanced Fallback Accretion onto the Nascent Lighter Compact Object: Tentative Evidence in the O3 Run Data of LIGO/Virgo
• A Common Origin for Low Mass Ratio Events Observed by LIGO and Virgo in the First Half of the Third Observing Run

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