Chemical enrichment in galaxies driven by SNIa feedback

NOELIA JIMENEZ; PATRICIA B. TISSERA; FRANCESCA MATTEUCCI

Paris

Workshop; Recontre de l'Observatoire 2013 / ESO Workshop; 2013

Galaxy formation constitutes a multi-scale highly non-linear process. Observations such as the galactic chemical abundances can set strong constrains on the galaxy formation models. The observed chemical patterns can relate nucleoshyntesis products coming from the stellar populations with the processes involved in the galaxy formation. This has been done both with the use of hydrodynamical cosmological simulations citep{Mosconi01,SC05,Tissera13}, and with semi-analytic models of galaxy formation citep{Pipino09,Jimenez11,Yates13}. It is well known that SN core collapse (SNe Type II) are produced by massive short-lived stars (M$>8$Msun). The residual production of these events feeds the interstellar medium (ISM) with energy and the $alpha$-elements (O, Ne, Mg, Si, S and Ca). On the other hand, the SNIa are the main contributors of the Fe in the Universe. The lifetime of SNIa are longer than SNII and consequence the relative enrichment of chemical element is different, impriting chemical features which can use as clocks. In this work, we present preliminary results of a extended work aim at testing the effects of using different life-time distributions for SNIa. In particular, we focus on Single Degenerate (SD) scenario. By studying of the enhancement of the $alpha$-elements relative, we learn about the time-scales in which SNIa becomes important and the efficiency of the feedback processes in galaxies.