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A stellar-mass black hole population in the globular cluster NGC 6101?

Peuten, Miklos, Zocchi, A, Gieles, Mark, Gualandris, Alessia and Henault-Brunet, V (2016) A stellar-mass black hole population in the globular cluster NGC 6101? Monthly Notices of the Royal Astronomical Society, 462 (3). pp. 2333-2342.

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Abstract

Dalessandro et al. observed a similar distribution for blue straggler stars and main-sequence turn-off stars in the Galactic globular cluster NGC 6101, and interpreted this feature as an indication that this cluster is not mass-segregated. Using direct N-body simulations, we find that a significant amount of mass segregation is expected for a cluster with the mass, radius and age of NGC 6101. Therefore, the absence of mass segregation cannot be explained by the argument that the cluster is not yet dynamically evolved. By varying the retention fraction of stellar-mass black holes, we show that segregation is not observable in clusters with a high black hole retention fraction (>50 per cent after supernova kicks and >50 per cent after dynamical evolution). Yet all model clusters have the same amount of mass segregation in terms of the decline of the mean mass of stars and remnants with distance to the centre. We also discuss how kinematics can be used to further constrain the presence of a stellar-mass black hole population and distinguish it from the effect of an intermediate-mass black hole. Our results imply that the kick velocities of black holes are lower than those of neutron stars. The large retention fraction during its dynamical evolution can be explained if NGC 6101 formed with a large initial radius in a Milky Way satellite.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Peuten, Miklosm.peuten@surrey.ac.ukUNSPECIFIED
Zocchi, AUNSPECIFIEDUNSPECIFIED
Gieles, Markm.gieles@surrey.ac.ukUNSPECIFIED
Gualandris, Alessiaa.gualandris@surrey.ac.ukUNSPECIFIED
Henault-Brunet, VUNSPECIFIEDUNSPECIFIED
Date : 7 September 2016
Identification Number : 10.1093/mnras/stw1726
Copyright Disclaimer : Copyright 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Uncontrolled Keywords : methods: numerical – stars: black holes – stars: kinematics and dynamics – globular clusters: general – globular clusters: individual: NGC 6101.
Depositing User : Symplectic Elements
Date Deposited : 09 Sep 2016 09:44
Last Modified : 11 Jul 2017 09:38
URI: http://epubs.surrey.ac.uk/id/eprint/812065

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