IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Alpha-element enhancement in a LCDM Universe
Autor/es:
GARGIULO, IGNACIO ; MUÑOZ ARANCIBIA, ALEJANDRA; CORA, SOFÍA A.; PADILLA, NELSON D.
Lugar:
San Juan
Reunión:
Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2011
Institución organizadora:
Asociación Argentina de Astronomía
Resumen:
Abstract. We study the chemical enrichment of elliptical galaxies using a semi-analytic model of galaxy formation combined with a cosmological Nbody simulation of dark matter particles. In particular, we study the α-element abundances with respect to the iron content of galaxies. The main modification to the previous models (Cora 2006; Lagos et al. 2008; Tecce et al. 2010) was the implementation of a top heavy variable initial mass function with a theoretical basis (Weidner & Kroupa 2004, 2005, 2006; Weidner et al. 2011). We find that with a single initial mass function at all epochs the observed trend of [Alpha/Fe] with the stellar mass of elliptical galaxies can be hardly reproduced. We propound that a top heavy integrated galactic mass function can be a plausible solution for this problem.