SciELO - Scientific Electronic Library Online

vol.20 issue2Simulation models generator: Applications in schedulingChallenges for statistics teaching and teacher’s training in Mexico author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


Revista de Matemática Teoría y Aplicaciones

Print version ISSN 1409-2433


NAVONE, Hugo D.  and  ZORZI, Alejandra F.. Comparative analysis of the orbital structure for non-cuspy and cuspy triaxial models of galaxies using different expansions of the gravitational potential. Rev. Mat [online]. 2013, vol.20, n.2, pp.243-255. ISSN 1409-2433.

One way to create models of elliptical galaxies is to start from a system of particles with a suitable distribution and to follow its evolution with an N-body code until it reaches equilibrium. In previous works we used the code of L.A. Aguilar to generate noncuspy and cuspy models, the latter giving a better representation of elliptical galaxies. However, the method proposed by Hernquist and Ostriker is more suitable for the cases with central cusps, because it uses an expansion of the potential in radial functions that already reflects the cuspy character. Here we consider two models, one non-cuspy and another cuspy, obtained with the method of Aguilar and whose potentials we now fit with the Hernquist and Ostriker expansion. We obtained the corresponding variational equations and we used them to determine the Lyapunov exponents of orbits already investigated with the method of Aguilar and to separate the chaotic ones. We classified the regular orbits through the analysis of their orbital frequencies. Here we present a comparison of the results obtained with the two methods for both types of orbits.

Keywords : stellar dynamics; cuspy triaxial stellar systems; orbital.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License