Local Ultra/Luminous Infrared Galaxies (U/LIRGs) have become the main laboratories to study the processes governing galaxy evolution and, thus, the evolution of the universe, at high spatial resolution and in high S/MN regime. Most of the previous Integral Field Spectroscopic (IFS) studies have been focused on studying the different phases of the gas. However, stars are the main component that governs the dynamics of these complex systems, and it is key to understand how LIRGs builds up their mass during their evolution. In this work, we present a SINFONI 2D-kinematical study of the stellar component for a sample of 10 local LIRGs. We have developed a model to infer the gravitational potential based on the photometry taken with NICMOS/F160W and the 2D stellar kinematics. We use a Markov Chain Monte Carlo to compare the SINFONI velocity maps, extracted from the CO absorption bands, with those expected from the stellar potentials and, estimate their dynamical masses. We will introduce the method and present preliminary results.

Trabajo presentado en KMOS@5: Star and Galaxy Formation in 3D - Challenges at KMOS 5th Year, celebrado en Garching (Alemania), del 3 al 6 de diciembre de 2018