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Mass models of NGC 6624 without an intermediate-mass black hole

Gieles, Mark, Balbinot, Eduardo, Yaaqib, Rashid, Hénault-Brunet, Vincent, Zocchi, Alice, Peuten, Miklos and Jonker, Peter G. (2017) Mass models of NGC 6624 without an intermediate-mass black hole Monthly Notices of the Royal Astronomical Society, 473 (4). pp. 4832-4839.

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An intermediate-mass black hole (IMBH) was recently reported to reside in the centre of the Galactic globular cluster (GC) NGC 6624, based on timing observations of a millisecond pulsar (MSP) located near the cluster centre in projection. We present dynamical models with multiple mass components of NGC 6624 – without an IMBH – which successfully describe the surface brightness profile and proper motion kinematics from the Hubble Space Telescope (HST) and the stellar mass function at different distances from the cluster centre. The maximum line-of-sight acceleration at the position of the MSP accommodates the inferred acceleration of the MSP, as derived from its first period derivative. With discrete realisations of the models we show that the higher-order period derivatives – which were previously used to derive the IMBH mass – are due to passing stars and stellar remnants, as previously shown analytically in literature. We conclude that there is no need for an IMBH to explain the timing observations of this MSP.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Yaaqib, Rashid
Hénault-Brunet, Vincent
Zocchi, Alice
Jonker, Peter G.
Date : 17 October 2017
DOI : 10.1093/mnras/stx2694
Copyright Disclaimer : © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Uncontrolled Keywords : Galaxies: star clusters. Globular clusters: general. Globular clusters: individual: NGC 6624. Stars: kinematics and dynamics. Stars: black holes. Pulsars: PSR B1820–30A.
Depositing User : Clive Harris
Date Deposited : 02 Nov 2017 09:01
Last Modified : 16 Jan 2019 19:03

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