Connecting Global to Local Parameters in Barred Galaxy Models

Journal of astrophysics and astronomy

N. D. Caranicolas1¹ 

[1] Department of Physics, Section of Astrophysics, Astronomy and Mechanics, University of Thessaloniki, 540 06 Thessaloniki, Greece.$$

关键词: Galaxies: barred;    orbits;    global and local parameters.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

We present connections between global and local parameters in a realistic dynamical model, describing motion in a barred galaxy. Expanding the global model in the vicinity of a stable Lagrange point, we find the potential of a two-dimensional perturbed harmonic oscillator, which describes local motion near the centre of the global model. The frequencies of oscillations and the coefficients of the perturbing terms are not arbitrary but are connected to the mass, the angular rotation velocity, the scale length and the strength of the galactic bar. The local energy is also connected to the global energy. A comparison of the properties of orbits in the global and local potential is also made.

【 授权许可】

Unknown