Evolution of the gas kinematics of galaxies in cosmological simulations

DE ROSSI, MARÍA EMILIA; PEDROSA, SUSANA ELIZABETH

Mar del Plata, Buenos Aires

Congreso; 55a Reunión Anual de la Asociación Argentina de Astronomía; 2012

Instituto Argentino de Radioastronomía

We studied the evolution of the gas kinematics of galaxies by performing hydrodynamical simulations in a cosmological scenario. We payed special attention to the origin of the scatter of the Tully-Fisher relation and the features which could be associated with mergers and interactions. We extended the study by De Rossi et al. (A&A, 519, A89, 2010) and analysed their whole simulated sample which includes both, gas disc-dominated and spheroid-dominated systems. We found that mergers and interactions can affect the rotation curves directly or indirectly inducing a scatter in the Tully-Fisher Relation larger than the simulated evolution since z ~ 3. In agreement with previous works, kinematical indicators which combine the rotation velocity and dispersion velocity in their definitions lead to a tighter relation. In addition, when we estimated the rotation velocity at the maximum of the rotation curve, we obtained the best proxy for the potential well regardless of morphology.