Effect of Chaotic Orbits on Dynamical Friction

When a body moves through a medium of smaller particles, it suffers a deceleration due to dynamical friction (Chandrasekhar 1943). Dynamical friction is inversely proportional to the relaxation time, which can be defined as the time needed for the orbits to experiment an energy exchange of the order...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Cora, Sofía Alejandra, Vergne, María Marcela, Muzzio, Juan Carlos
Formato: Articulo Comunicacion
Lenguaje:Inglés
Publicado: 1999
Materias:
Ciencias Astronómicas
Physics
Exponential function
Generalization
Orbital decay
Chaotic
Dynamical friction
Chandrasekhar limit
Classical mechanics
Galaxy
Black hole
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123080
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123080
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Physics
Exponential function
Generalization
Orbital decay
Chaotic
Dynamical friction
Chandrasekhar limit
Classical mechanics
Galaxy
Black hole
spellingShingle Ciencias Astronómicas
Physics
Exponential function
Generalization
Orbital decay
Chaotic
Dynamical friction
Chandrasekhar limit
Classical mechanics
Galaxy
Black hole
Cora, Sofía Alejandra
Vergne, María Marcela
Muzzio, Juan Carlos
Effect of Chaotic Orbits on Dynamical Friction
topic_facet Ciencias Astronómicas
Physics
Exponential function
Generalization
Orbital decay
Chaotic
Dynamical friction
Chandrasekhar limit
Classical mechanics
Galaxy
Black hole
description When a body moves through a medium of smaller particles, it suffers a deceleration due to dynamical friction (Chandrasekhar 1943). Dynamical friction is inversely proportional to the relaxation time, which can be defined as the time needed for the orbits to experiment an energy exchange of the order of their initial energies, as a result of the perturbations produced by stellar encounters. Chaotic orbits, present in non-integrable systems, have exponential sensitivity to perturbations, a feature that makes them to relax in a time much shorter than regular ones, which suggests that dynamical friction would increase in the presence of chaotic orbits (Pfenniger 1986). We present preliminary results of numerical experiments used to check this idea, investigating the orbital decay, caused by dynamical friction, of a rigid satellite which moves within a larger stellar system (a galaxy) whose potential is non-integrable. Triaxial models with similar density distributions but different percentages of chaotic orbits are considered. This last quantity depends on the central concentration of the models. If the potential corresponds to triaxial mass models with smooth cores, the regular orbits have shapes that can be identified with one of the four families of regular orbits in Stackel potentials (box and three types of tubes). Chaotic orbits behave very much like regular orbits for hundreds of oscillations at least. In this case, the galaxy is represented by the triaxial generalization of the γ-models with γ = 0 (Merritt & Fridman 1996). However, the situation is very different in triaxial models with divergent central densities (cusps) or black holes, a feature that is in agreement with the observations.
format Articulo
Comunicacion
author Cora, Sofía Alejandra
Vergne, María Marcela
Muzzio, Juan Carlos
author_facet Cora, Sofía Alejandra
Vergne, María Marcela
Muzzio, Juan Carlos
author_sort Cora, Sofía Alejandra
title Effect of Chaotic Orbits on Dynamical Friction
title_short Effect of Chaotic Orbits on Dynamical Friction
title_full Effect of Chaotic Orbits on Dynamical Friction
title_fullStr Effect of Chaotic Orbits on Dynamical Friction
title_full_unstemmed Effect of Chaotic Orbits on Dynamical Friction
title_sort effect of chaotic orbits on dynamical friction
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/123080
work_keys_str_mv AT corasofiaalejandra effectofchaoticorbitsondynamicalfriction
AT vergnemariamarcela effectofchaoticorbitsondynamicalfriction
AT muzziojuancarlos effectofchaoticorbitsondynamicalfriction
bdutipo_str Repositorios
_version_ 1764820449691172865

Ejemplares similares