Impact on the ICM of the galactic fountain and the galactic winds.

CRISTIAN ANTONIO VEGA MARTINEZ; SOFIA A. CORA; NELSON D. PADILLA; ANDRÉS N. RUIZ

Buenos Aires

Workshop; Third workshop on numerical and observational astrophysics; 2014

Instituto de Astronomía y Física del Espacio

We study the chemical properties of galaxies and the intracluster medium (ICM) by using an hybrid technique which combines a semi-analytic model of galaxy formation and cosmological N-body/SPH simulations of clusters of galaxies. In the semi-analytic model we include a multiphase treatment of the interstellar medium, calculating the amount of evaporated mass of the cold clouds within the galaxies due to supernova remnants. Subsequently, we perform an instantaneous estimation of the resulting galactic wind which contaminates the ICM, considering also the fraction of this mass which has not enough energy for escaping the galactic gravitational well. This material will cool again and return to the galaxy with a delay time creating a galactic fountain. We found that the galactic winds are persistent in the less massive galaxies; their final velocities statistically increase with redshift and are within observed ranges. The galactic fountain process becomes important in massive galaxies and it has an important effect on the chemical evolution of the galaxies and the ICM by reactivating the star formation when the ejected material returns to the galactic discs.