Cinématique et dynamique galactiques

Abstract : Dynamically self-consistent galactic models are necessary for analysing and interpreting star counts, stellar density distributions, and stellar kinematics in order to understand the formation and the evolution of our Galaxy. This thesis aims to modify and improve the dynamical self-consistency of the Besançon Galaxy model in the case of a stationary and axisymmetric gravitational potential. Each stellar orbit is modelled by determining a Stäckel approximate integral of motion. Generalised Shu distribution functions (DFs) with three integrals of motion are used to model the stellar distribution functions. This new version of the Besançon model is compared with the previous axisymmetric BGM2014 version and we find that the two versions have similar densities for each stellar component. The dynamically self-consistency is improved and can be tested by recovering the forces and the potential through the Jeans equations applied to each stellar distribution function. Forces are recovered with an accuracy better than 1 % over most of the volume of the Galaxy.
Complete list of metadatas

Cited literature [157 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02277457
Contributor : Abes Star <>
Submitted on : Tuesday, September 3, 2019 - 3:47:07 PM
Last modification on : Wednesday, September 4, 2019 - 1:21:01 AM

File

Leca_Jerome_2019_ED182.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02277457, version 1

Collections

Citation

Jérôme Leca. Cinématique et dynamique galactiques. Astrophysique [astro-ph]. Université de Strasbourg, 2019. Français. ⟨NNT : 2019STRAE003⟩. ⟨tel-02277457⟩

Share

Metrics

Record views

58

Files downloads

12