IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Cosmic queuing: galaxy satellites, building blocks and the hierarchical clustering paradigm
Autor/es:
C. DEL P. LAGOS, N. D. PADILLA, S. A. CORA
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Rayal Astronomical Society by Wiley-Blackwell Pub.
Referencias:
Lugar: Londres ; Año: 2009 vol. 397 p. 31 - 35
ISSN:
0035-8711
Resumen:
We study the properties of building blocks (BBs, i.e. accreted satellites) and surviving satellites of present-day galaxies using the {small SAG} semi-analytic model of galaxy formation in the context of a concordance Lambda Cold Dark Matter (LambdaCDM) cosmology. We consider large numbers of DM halo merger trees spanning a widerange of masses (1 x10^{10} - 2.14 x 10^{15}  M_sun). We find higher metallicities for BBs with respect to surviving satellites, an effect produced by the same processes behind the build-up of the mass-metallicity relation. We prove that the responsible for these metallicity differences is the higher peak height in the density fluctuation field occupied by BBs BBs start to form stars and central galaxies which have collapsed into a single object earlier than surviving satellites.earlier, during the peak of the merger activity in LambdaCDM, and build-up half of their final stellar mass (measured at the moment of disruption) up to four times faster than surviving satellites. Surviving satellites keep increasing their stellar masses rather quiescently down to z~1. The difference between the metallicities of satellites,BBs and central galaxies depends on the host DM halo mass, in a way that can be used as a further test for the concordance cosmology.