Evolution of Disk Galaxies in LCDM

Luis Fernando Quiroga Peláez
Título conseguido: 
Magister en Física
Astronomía, Astrofísica Galáctica
Universidad de Antioquia
Fecha de Grado: 
Tuesday, March 3, 2015 - 23:00
Juan Carlos Muñoz Cuartas
We present in this work the results of the study of the evolution of disk galaxies in a cosmological context. We used the merger trees of three dark matter halos candidates to Milky May type halos selected from a set of cosmological simulations tuned to form a Local Group at redshift zero (CLUES project). For each candidate we reproduced the three minor mergers that more affect its dynamics. Inside of each dark matter halo we build a disk according to its properties and we analyzed the influence in the evolution and survival of the minor mergers over that disk. We found that minor mergers with a satellite-to-host mass ratio less than 16% leads to disks that survive because the transfer of lineal momentum and angular momentum to the disk in this mergers is low. We also saw that the final state of the disk depends on the initial orientation of its, an orientation initial of the disk where its angular momentum is parallel to the halo angular momentum minimizes the destructive power of the satellites.