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.

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

Bonetti, M;Bortolas, E;Lupi, A;Dotti, M;
2020-01-01

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.
2020
Galaxies: nuclei; Galaxies: structure; Gravitation; Methods: numerical; Stars: kinematics and dynamics
Bonetti, M; Bortolas, E; Lupi, A; Dotti, M; Raimundo, Si
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2147999
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