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Article Dans Une Revue Astrophys.J.Lett. Année : 2020

GW190412 as a Third-Generation Black Hole Merger from a Super Star Cluster

Carl L. Rodriguez
  • Fonction : Auteur
Kyle Kremer
Michael Y. Grudic
  • Fonction : Auteur
Zachary Hafen
Sourav Chatterjee
Giacomo Fragione
Miguel A.S. Martinez
  • Fonction : Auteur
Frederic A. Rasio
  • Fonction : Auteur
Newlin Weatherford
Claire S. Ye
  • Fonction : Auteur

Résumé

We explore the possibility that GW190412, a binary black hole merger with a non-equal-mass ratio and significantly spinning primary, was formed through repeated black hole mergers in a dense super star cluster. Using a combination of semianalytic prescriptions for the remnant spin and recoil kick of black hole mergers, we show that the mass ratio and spin of GW190412 are consistent with a binary black hole whose primary component has undergone two successive mergers from a population of black holes in a high-metallicity environment. We then explore the production of GW190412-like analogs in the CMC Cluster Catalog, a grid of 148 N-body star cluster models, as well as a new model, behemoth, with nearly 107 particles and initial conditions taken from a cosmological MHD simulation of galaxy formation. We show that, if the spins of black holes born from stars are small, the production of binaries with GW190412-like masses and spins is dominated by massive super star clusters with high metallicities and large central escape speeds. While many are observed in the local universe, our results suggest that a careful treatment of these massive clusters, many of which may have been disrupted before the present day, is necessary to characterize the production of unique gravitational-wave events produced through dynamics.

Dates et versions

hal-02739752 , version 1 (02-06-2020)

Identifiants

Citer

Carl L. Rodriguez, Kyle Kremer, Michael Y. Grudic, Zachary Hafen, Sourav Chatterjee, et al.. GW190412 as a Third-Generation Black Hole Merger from a Super Star Cluster. Astrophys.J.Lett., 2020, 896 (1), pp.L10. ⟨10.3847/2041-8213/ab961d⟩. ⟨hal-02739752⟩
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