In this paper we study the evolution of a primordial black hole binary (BHB) in a sample of over 1500 direct-summation N-body simulations of small- and intermediate-size isolated star clusters as proxies of Galactic open clusters. The BHBs have masses in the range of the first LIGO/Virgo detections. Some of our models show a significant hardening of the BHB in a relatively short time. Some of them merge within the cluster, while ejected binaries, typically, have exceedingly long merger time-scales. The perturbation of stars around BHB systems is key to induce their coalescence. The BHBs which merge in the cluster could be detected with a delay of a few years between space detectors, as future LISA, and ground-based ones, due to their relatively high eccentricity. Under our assumptions, we estimate a BHB merger rate of Rmrg ̃ 2 yr-1 Gpc-3. We see that in many cases the BHB triggers tidal disruption events which, however, are not linked to the GW emission. Open cluster-like systems are, hence, a promising environment for GWs from BHBs and tidal disruptions.

Stellar black hole binary mergers in open clusters / Rastello, S; Amaro-Seoane, P; Arca-Sedda, M; Capuzzo-Dolcetta, R; Fragione, G; Tosta e Melo, I. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 483:1(2019), pp. 1233-1246. [10.1093/mnras/sty3193]

Stellar black hole binary mergers in open clusters

Rastello, S
Investigation
;
Amaro-Seoane, P
Validation
;
Arca-Sedda, M
Formal Analysis
;
Capuzzo-Dolcetta, R
Supervision
;
Fragione, G
Investigation
;
Tosta e Melo, I
Data Curation
2019

Abstract

In this paper we study the evolution of a primordial black hole binary (BHB) in a sample of over 1500 direct-summation N-body simulations of small- and intermediate-size isolated star clusters as proxies of Galactic open clusters. The BHBs have masses in the range of the first LIGO/Virgo detections. Some of our models show a significant hardening of the BHB in a relatively short time. Some of them merge within the cluster, while ejected binaries, typically, have exceedingly long merger time-scales. The perturbation of stars around BHB systems is key to induce their coalescence. The BHBs which merge in the cluster could be detected with a delay of a few years between space detectors, as future LISA, and ground-based ones, due to their relatively high eccentricity. Under our assumptions, we estimate a BHB merger rate of Rmrg ̃ 2 yr-1 Gpc-3. We see that in many cases the BHB triggers tidal disruption events which, however, are not linked to the GW emission. Open cluster-like systems are, hence, a promising environment for GWs from BHBs and tidal disruptions.
2019
black hole physics; gravitational waves; stars: black holes; stars: kinematics and dynamics; open clusters and associations: general; Astrophysics - Astrophysics of Galaxies
01 Pubblicazione su rivista::01a Articolo in rivista
Stellar black hole binary mergers in open clusters / Rastello, S; Amaro-Seoane, P; Arca-Sedda, M; Capuzzo-Dolcetta, R; Fragione, G; Tosta e Melo, I. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 483:1(2019), pp. 1233-1246. [10.1093/mnras/sty3193]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1249351
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