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Title: Alternative possibility of GW190521: Gravitational waves from high-mass black hole-disk systems
Authors: Shibata, Masaru  kyouindb  KAKEN_id
Kiuchi, Kenta
Fujibayashi, Sho
Sekiguchi, Yuichiro
Author's alias: 柴田, 大
木内, 建太
Keywords: Gravitational wave sources
Accretion disk & black-hole plasma
Numerical relativity
Gravitation, Cosmology & Astrophysics
Issue Date: Mar-2021
Publisher: American Physical Society (APS)
Journal title: Physical Review D
Volume: 103
Issue: 6
Thesis number: 063037
Abstract: We evolve high-mass disks of mass 15–50 M⊙ orbiting a 50 M⊙ spinning black hole in the framework of numerical relativity. Such high-mass systems could be an outcome during the collapse of rapidly rotating very massive stars. The massive disks are dynamically unstable to the so-called one-armed spiral-shape deformation with the maximum fractional density perturbation of δρ/ρ≳0.1, and hence, high-amplitude gravitational waves are emitted. The waveforms are characterized by an initial high-amplitude burst with the frequency of ∼40–50 Hz and the maximum amplitude of (1–10)×10⁻²² at the hypothetical distance of 100 Mpc and by a subsequent low-amplitude quasiperiodic oscillation. We illustrate that the waveforms in our models with a wide range of the disk mass resemble that of GW190521. We also point out that gravitational waves from rapidly rotating very massive stars can be the source for 3rd-generation gravitational-wave detectors for exploring the formation process of rapidly spinning high-mass black holes of mass ∼50–100 M⊙ in an early universe.
Rights: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
DOI(Published Version): 10.1103/PhysRevD.103.063037
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