The Tully-Fisher Relation and the dynamical evolution of galaxies

DE ROSSI, MARÍA EMILIA; TISSERA, PATRICIA BEATRIZ; PEDROSA, SUSANA ELIZABETH

San Juan

Congreso; Primera Reunión Anual Binacional entre la Asociación Argentina de Astronomía y la Sociedad Chilena de Astronomía (54 Reunión Anual de la AAA, IX Reunión Anual de la SOCHIAS); 2011

Asociación Argentina de Astronomía y Sociedad Chilena de Astronomía

We studied the dynamical and kinematical properties of galaxies since z~3 by performing numerical simulations in a Lambda-CDM universe. Our results suggest that the maximum gas-phase rotation velocity of the disc component is a good proxy for the circular velocity at that radius regardless of the galaxy morphology.  We also found that velocity scales which combine dispersion and rotation velocity in their definition lead to a tighter Tully-Fisher Relation. In particular, the lowest scatter in the correlation between mass and velocity is obtained if the kinematical indicator is evaluated at the radius corresponding to the maximum of the rotation curve. In these simulations, the evolution of the scatter of the Tully-Fisher Relation seems to be strongly modulating by galaxy interactions and mergers which can drive gas inflows and outflows regulating the star formation process and feedback mechanisms inside these systems.