English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the relationship between the global properties of starclusters and their double black hole (DBH) populations. We use the code {\ttNBODY6} to evolve a suite of star cluster models with an initial mass of$\mathcal{O}(10^4)$M$_\odot$ and varying initial parameters. We conclude thatcluster metallicity plays the most significant role in determining the lifespanof a cluster, while the initial half-mass radius is dominant in setting therate of BH exchange interactions in the central cluster regions. We find thatthe mass of interacting BHs, rather than how frequently their interactions withother BHs occur, is more crucial in the thermal expansion and eventualevaporation of the cluster. We formulate a novel approach to easily quantifythe degree of BH-BH dynamical activity in each model. We report 12 in-clusterand three out-of-cluster (after ejection from the cluster) DBH mergers, ofdifferent types (inspiral, eccentric, hierarchical) across the ten $N$-bodymodels presented. Our DBH merger efficiency is 3--4$\times10^{-5}$ mergers perM$_\odot$. We note the cluster initial density plays the most crucial role indetermining the number of DBH mergers, with the potential presence of atransitional density point (between 1.2-3.8$\times10^3$M$_\odot$/pc$^3$) belowwhich the number of in-cluster mergers increases with cluster density and abovewhich the increased stellar density acts to prevent in-cluster BH mergers. Theimportance of the history of dynamical interactions within the cluster insetting up the pathways to ejected DBH mergers is also discussed. Our findingsshow a broad match with observed LIGO-Virgo DBH mergers.

Dynamical double black holes and their host cluster properties