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Dynamical friction-driven orbital circularization in rotating discs: A semi-analytical description

Dynamical friction-driven orbital circularization in rotating discs: A semi-analytical description
Dynamical friction-driven orbital circularization in rotating discs: A semi-analytical description

We present and validate a novel semi-analytical approach to study the effect of dynamical friction (DF) on the orbits of massive perturbers in rotating stellar discs. We find that DF efficiently circularizes the orbit of co-rotating perturbers, while it constantly increases the eccentricity of counter-rotating ones until their angular momenta reverse, then once again promoting circularization. Such ‘drag toward circular co-rotation’ could shape the distribution of orientations of kinematically decoupled cores in disc galaxies, naturally leading to the observed larger fraction of co-rotating cores.

Galaxies: nuclei, Galaxies: structure, Gravitation, Methods: numerical, Stars: kinematics and dynamics
0035-8711
3053-3059
Bonetti, Matteo
e1df0788-3bca-4629-8f4a-f59b6ce89f66
Bortolas, Elisa
ad54eb0b-4c03-46b3-915a-7bf4edd6b1cb
Lupi, Alessandro
0d4472d8-c68c-415e-afd3-d825c2b6250f
Dotti, Massimo
0e4d7886-18eb-452e-a69f-5bb3e963ceda
De Jesus Raimundo, Sandra
e409d9d3-17e8-4049-ad29-43ada60b24e2
Bonetti, Matteo
e1df0788-3bca-4629-8f4a-f59b6ce89f66
Bortolas, Elisa
ad54eb0b-4c03-46b3-915a-7bf4edd6b1cb
Lupi, Alessandro
0d4472d8-c68c-415e-afd3-d825c2b6250f
Dotti, Massimo
0e4d7886-18eb-452e-a69f-5bb3e963ceda
De Jesus Raimundo, Sandra
e409d9d3-17e8-4049-ad29-43ada60b24e2

Bonetti, Matteo, Bortolas, Elisa, Lupi, Alessandro, Dotti, Massimo and De Jesus Raimundo, Sandra (2020) Dynamical friction-driven orbital circularization in rotating discs: A semi-analytical description. Monthly Notices of the Royal Astronomical Society, 494 (2), 3053-3059. (doi:10.1093/mnras/staa964).

Record type: Article

Abstract

We present and validate a novel semi-analytical approach to study the effect of dynamical friction (DF) on the orbits of massive perturbers in rotating stellar discs. We find that DF efficiently circularizes the orbit of co-rotating perturbers, while it constantly increases the eccentricity of counter-rotating ones until their angular momenta reverse, then once again promoting circularization. Such ‘drag toward circular co-rotation’ could shape the distribution of orientations of kinematically decoupled cores in disc galaxies, naturally leading to the observed larger fraction of co-rotating cores.

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Dynamical friction-driven orbital circularisation in rotating discs a semi-analytical description - Accepted Manuscript
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Accepted/In Press date: 20 March 2020
e-pub ahead of print date: 15 April 2020
Published date: 11 May 2020
Additional Information: Funding Information: Numerical calculations have been made possible through a CINECA-INFN agreement, providing access to resources on GALILEO and MARCONI at CINECA. AL acknowledges support from the European Research Council No. 740120 ‘INTERSTELLAR’. EB acknowledges support from the Swiss National Science Foundation under the Grant 200020 178949. SIR gratefully acknowledges support from the Independent Research Fund Denmark via grant numbers DFF 4002-00275 and 8021-00130. MD acknowledges Giuseppe Lodato for pointing out that the expression ‘angular momentum flip’ could be misleading (see footnote 1). Publisher Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
Keywords: Galaxies: nuclei, Galaxies: structure, Gravitation, Methods: numerical, Stars: kinematics and dynamics

Identifiers

Local EPrints ID: 444016
URI: http://eprints.soton.ac.uk/id/eprint/444016
ISSN: 0035-8711
PURE UUID: 09a2279b-961f-45eb-9f95-7730d65486f5

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Date deposited: 22 Sep 2020 16:31
Last modified: 08 Nov 2022 18:24

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Contributors

Author: Matteo Bonetti
Author: Elisa Bortolas
Author: Alessandro Lupi
Author: Massimo Dotti

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