Hypervelocity binaries (HVBs) can be produced by a close encounter between stellar binaries and supermassive black hole (SMBH)-intermediate massive black hole (IMBH) binaries. We perform scattering experiments between tight stellar binaries and an SMBH-IMBH binary (within the observationally allowed parameters), using high-precision N-body integrations. Simulation results show that only a few HVBs can be produced in the Galactic centre if it harbours a 4 × 103 M IMBH. However, we find that tight HVBs can be efficiently produced in prograde coplanar orbits with respect to the SMBH-IMBH binary. Therefore, the trajectories of the HVBs provide a promising way to constrain the IMBH orbital plane, if one exists. More importantly, we find that the ejected tight binaries are eccentric. For other galaxies hosting equal-mass SMBH binaries for which the HVB ejection rate is much higher relative to SMBH-IMBH binaries, these ejected compact binaries constitute promising extragalactic merger sources that could be detected by gravitational wave detectors.

Wang, Y., Leigh, N., Sesana, A., Perna, R. (2019). Hypervelocity binaries from close encounters with a SMBH-IMBH binary: Orbital properties and diagnostics. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 482(3), 3206-3218 [10.1093/mnras/sty2866].

Hypervelocity binaries from close encounters with a SMBH-IMBH binary: Orbital properties and diagnostics

Sesana A.;
2019

Abstract

Hypervelocity binaries (HVBs) can be produced by a close encounter between stellar binaries and supermassive black hole (SMBH)-intermediate massive black hole (IMBH) binaries. We perform scattering experiments between tight stellar binaries and an SMBH-IMBH binary (within the observationally allowed parameters), using high-precision N-body integrations. Simulation results show that only a few HVBs can be produced in the Galactic centre if it harbours a 4 × 103 M IMBH. However, we find that tight HVBs can be efficiently produced in prograde coplanar orbits with respect to the SMBH-IMBH binary. Therefore, the trajectories of the HVBs provide a promising way to constrain the IMBH orbital plane, if one exists. More importantly, we find that the ejected tight binaries are eccentric. For other galaxies hosting equal-mass SMBH binaries for which the HVB ejection rate is much higher relative to SMBH-IMBH binaries, these ejected compact binaries constitute promising extragalactic merger sources that could be detected by gravitational wave detectors.
Articolo in rivista - Articolo scientifico
Black hole physics
English
2019
482
3
3206
3218
none
Wang, Y., Leigh, N., Sesana, A., Perna, R. (2019). Hypervelocity binaries from close encounters with a SMBH-IMBH binary: Orbital properties and diagnostics. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 482(3), 3206-3218 [10.1093/mnras/sty2866].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/290597
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