Galaxies are self-gravitating structures composed by several components encompassing spherical, axial, and triaxial symmetry. Although real systems feature heterogeneous components whose properties are intimately connected, semi-analytical approaches often exploit the linearity of the Poisson’s equation to represent the potential and mass distribution of a multicomponent galaxy as the sum of the individual components. In this work, we expand the semi-analytical framework developed in Bonetti et al. (2020) by including both a detailed implementation of the gravitational potential of exponential disc (modelled with a sech2 and an exponential vertical profile) and an accurate prescription for the dynamical friction experienced by massive perturbers (MP) in composite galaxy models featuring rotating disc structures. Such improvements allow us to evolve arbitrary orbits either within or outside the galactic disc plane. We validate the results obtained by our numerical model against public semi-analytical codes as well as full N-body simulations, finding that our model is in excellent agreement to the codes it is compared with. The ability to reproduce the relevant physical processes responsible for the evolution of MP orbits and its computational efficiency make our framework perfectly suited for large parameter-space exploration studies.

Bonetti, M., Bortolas, E., Lupi, A., Dotti, M. (2021). Dynamical evolution of massive perturbers in realistic multicomponent galaxy models I: implementation and validation. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 502(3), 3554-3568 [10.1093/mnras/stab222].

Dynamical evolution of massive perturbers in realistic multicomponent galaxy models I: implementation and validation

Bonetti, Matteo
Primo
;
Bortolas, Elisa
Secondo
;
Lupi, Alessandro
Penultimo
;
Dotti, Massimo
Ultimo
2021

Abstract

Galaxies are self-gravitating structures composed by several components encompassing spherical, axial, and triaxial symmetry. Although real systems feature heterogeneous components whose properties are intimately connected, semi-analytical approaches often exploit the linearity of the Poisson’s equation to represent the potential and mass distribution of a multicomponent galaxy as the sum of the individual components. In this work, we expand the semi-analytical framework developed in Bonetti et al. (2020) by including both a detailed implementation of the gravitational potential of exponential disc (modelled with a sech2 and an exponential vertical profile) and an accurate prescription for the dynamical friction experienced by massive perturbers (MP) in composite galaxy models featuring rotating disc structures. Such improvements allow us to evolve arbitrary orbits either within or outside the galactic disc plane. We validate the results obtained by our numerical model against public semi-analytical codes as well as full N-body simulations, finding that our model is in excellent agreement to the codes it is compared with. The ability to reproduce the relevant physical processes responsible for the evolution of MP orbits and its computational efficiency make our framework perfectly suited for large parameter-space exploration studies.
Articolo in rivista - Articolo scientifico
Galaxies: nuclei; Galaxies: Structure; Gravitation; Methods: numerical; Stars: Kinematics and dynamics;
English
28-gen-2021
2021
502
3
3554
3568
none
Bonetti, M., Bortolas, E., Lupi, A., Dotti, M. (2021). Dynamical evolution of massive perturbers in realistic multicomponent galaxy models I: implementation and validation. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 502(3), 3554-3568 [10.1093/mnras/stab222].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/315465
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