The Origin and Evolution of the Tully-Fisher Relation in a Lambda-CDM Universe

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

Santiago de Chile

Workshop; Multiwavelength Views of the ISM in High-Redshift Galaxies; 2011

European Southern Observatory

We studied the stellar (sTFR) and baryonic (bTFR) Tully-Fisher relation from z = 3 by performing hydrodynamical simulations in a Lambda-CDM cosmology.  The TFR was analysed simultaneously with the formation history of simulated galaxies. We found that Supernova (SN) feedback seems to play a fundamental role in shaping the TFR from high redshifts by regulating the star formation efficiency of galaxies and triggering powerful galactic outflows.  In particular, the more efficient action of SN feedback in shallower potential wells generates a bend in the TFR at its low-mass end, consistently with observations (De Rossi et al. 2010).  Moreover, our results indicate that the scatter of the simulated TFR is strongly modulating by galaxy interactions and mergers which affect the gas kinematics and produce TFR outliers.  Our simulations suggest that these effects are more dramatic for low-mass galaxies and at high redshifts.