Observations show the presence, in the halo of our Galaxy, of stars moving at velocities so high to require an acceleration mechanism involving the presence of a massive central black hole. Thus, in the frame of a galaxy hosting a supermassive black hole (108 M⊙) we investigated a mechanism for the production of high-velocity stars, which was suggested by the results of N-body simulations of the close interaction between a massive, orbitally decayed, globular cluster and the supermassive black hole. The high velocity acquired by some stars of the cluster comes from the transfer of gravitational binding energy into kinetic energy of the escaping star originally orbiting around the cluster. After the close interaction with the massive black hole, stars could reach a velocity sufficient to travel in the halo and even overcome the galactic gravitational well, while some of them are just stripped from the globular cluster and start orbiting on precessing loops around the galactic centre.

High-velocity stars from close interaction of a globular cluster and a supermassive black hole / CAPUZZO DOLCETTA, Roberto Angelo; Fragione, Giacomo. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 454:3(2015), pp. 2677-2690. [10.1093/mnras/stv2123]

High-velocity stars from close interaction of a globular cluster and a supermassive black hole

CAPUZZO DOLCETTA, Roberto Angelo;FRAGIONE, GIACOMO
2015

Abstract

Observations show the presence, in the halo of our Galaxy, of stars moving at velocities so high to require an acceleration mechanism involving the presence of a massive central black hole. Thus, in the frame of a galaxy hosting a supermassive black hole (108 M⊙) we investigated a mechanism for the production of high-velocity stars, which was suggested by the results of N-body simulations of the close interaction between a massive, orbitally decayed, globular cluster and the supermassive black hole. The high velocity acquired by some stars of the cluster comes from the transfer of gravitational binding energy into kinetic energy of the escaping star originally orbiting around the cluster. After the close interaction with the massive black hole, stars could reach a velocity sufficient to travel in the halo and even overcome the galactic gravitational well, while some of them are just stripped from the globular cluster and start orbiting on precessing loops around the galactic centre.
2015
stars: kinematics and dynamics; galaxies: haloes; galaxies: nuclei; galaxies: star clusters
01 Pubblicazione su rivista::01a Articolo in rivista
High-velocity stars from close interaction of a globular cluster and a supermassive black hole / CAPUZZO DOLCETTA, Roberto Angelo; Fragione, Giacomo. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 454:3(2015), pp. 2677-2690. [10.1093/mnras/stv2123]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/867248
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