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.

Bonetti, M., Bortolas, E., Lupi, A., Dotti, M., Raimundo, S. (2020). Dynamical friction-driven orbital circularization in rotating discs: A semi-analytical description. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 494(2), 3053-3059 [10.1093/mnras/staa964].

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

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

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.
Articolo in rivista - Articolo scientifico
Galaxies: nuclei; Galaxies: structure; Gravitation; Methods: numerical; Stars: kinematics and dynamics;
English
2020
494
2
3053
3059
open
Bonetti, M., Bortolas, E., Lupi, A., Dotti, M., Raimundo, S. (2020). Dynamical friction-driven orbital circularization in rotating discs: A semi-analytical description. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 494(2), 3053-3059 [10.1093/mnras/staa964].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/273066
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