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A hypervelocity star with a Magellanic origin

Erkal, Denis, Boubert, Douglas, Gualandris, Alessia, Evans, N. Wyn and Antonini, Fabio (2018) A hypervelocity star with a Magellanic origin Monthly Notices of the Royal Astronomical Society.

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Abstract

Using proper motion measurements from Gaia DR2, we probe the origin of 26 previously known hypervelocity stars (HVSs) around the Milky Way. We find that a significant fraction of these stars have a high probability of originating close to the Milky Way centre, but there is one obvious outlier. HVS3 is highly likely to be coming almost from the centre of the Large Magellanic Cloud (LMC). During its closest approach, 21.1 +6.1 −4.6 Myr ago, it had a relative velocity of 870 +69 −66 kms −1 with respect to the LMC. This large kick velocity is only consistent with the Hills mechanism, requiring a massive black hole at the centre of the LMC. This provides strong direct evidence that the LMC itself harbours a massive black hole of at least 4×10 3 −10 4 M ⊙ .

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Erkal, Denisd.erkal@surrey.ac.uk
Boubert, Douglas
Gualandris, Alessiaa.gualandris@surrey.ac.uk
Evans, N. Wyn
Antonini, Fabiof.antonini@surrey.ac.uk
Date : 2018
Funders : Science and Technology Facilities Council (STFC)
Copyright Disclaimer : © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 Erkal et al. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords : Galaxies: hypervelocity stars.
Related URLs :
Depositing User : Clive Harris
Date Deposited : 03 Oct 2018 14:10
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/849526

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