Abstract

VALENCIA-ENRIQUEZ, D.; PUERARI, I.  and  CHAVES-VELASQUEZ, L.. Detecting the Growth of Structures in Pure Stellar Disk Models. Rev. mex. astron. astrofis [online]. 2017, vol.53, n.2, 00009.  Epub Oct 21, 2019. ISSN 0185-1101.

We performed a series of 3D N-body simulations where the initial conditions were chosen to get two sets of models; unbarred and barred ones. In this work, we analyze the growth of spirals and bar structures using 1D, and 2D Fourier transform (FT) methods. Spectrograms and diagrams of the amplitude of the Fourier coefficients as a function of time, radius and pitch angle show that the general morphology of our modeled galaxies is due to the superposition of structures which have different values of pitch angle and number of arms. Also, in barred models a geometric classification of orbits from the bar reference frame was done, showing that the barred potential and the Lagrangian points L 4 and L 5 catch approximately one-third of the total disk mass.

Keywords : galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure; methods; numerical.

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