INVESTIGADORES
DE ROSSI Maria Emilia
congresos y reuniones científicas
Título:
Study of the origin of the Luminosity-Metallicity and the Stellar Mass-Metallicity relations in hierarchical universes
Autor/es:
DE ROSSI, MARÍA EMILIA; TISSERA, PATRICIA BEATRIZ; SCANNAPIECO, CECILIA
Lugar:
La Plata, Buenos Aires, Argentina
Reunión:
Congreso; Reunión Anual de la Asociación Argentina de Astronomía Nro. 48; 2005
Institución organizadora:
Asociación Argentina de Astronomía
Resumen:
In this work, we study the Luminosity-Metallicity relation (LMR) and the Stellar Mass -Metallicity relation (MMR) of galactic systems in a hierarhical clustering scenario. We performed numerical hydrodynamical simulations with the chemical GADGET-2 of Scannapieco et al.(2005) in a Lambda CDM universe. We found that our simulated galactic systems reproduce the observed local LMR and its evolution in zero point and slope. The simulated MMR is also in agreement with recent observational results. From the analysis of the evolution of the MMR, we found a characteristic mass at 10^10.2 Mo/h which separates two galactic populations with different astrophysical properties. More massive systems tend to have their stars formed at z > 2 and show less evolution than smaller systems. Hence, this characteristic mass is determined by the formation of the structure in a hierarchical scenario. Our results also suggest the need for important supernova feedback.
