Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm

We study the properties of building blocks (BBs; i.e. accreted satellites) and surviving satellites of present-day galaxies using the semi-analytic model of galaxy formation SAG ('semi-analytic galaxies') in the context of a concordance Λ cold dark matter (ΛCDM) cosmology. We consider larg...

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Detalles Bibliográficos
Autores principales: Lagos, Claudia P. del, Padilla, Nelson D., Cora, Sofía Alejandra
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Galaxies: evolution
Galaxies: formation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82725
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82725
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: evolution
Galaxies: formation
spellingShingle Ciencias Astronómicas
Galaxies: evolution
Galaxies: formation
Lagos, Claudia P. del
Padilla, Nelson D.
Cora, Sofía Alejandra
Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm
topic_facet Ciencias Astronómicas
Galaxies: evolution
Galaxies: formation
description We study the properties of building blocks (BBs; i.e. accreted satellites) and surviving satellites of present-day galaxies using the semi-analytic model of galaxy formation SAG ('semi-analytic galaxies') in the context of a concordance Λ cold dark matter (ΛCDM) cosmology. We consider large number of dark matter (DM) halo merger trees spanning a wide range of masses (~1 × 1010-2.14 × 1015 M⊙). 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 these metallicity differences arise from the higher peak height in the density fluctuation field occupied by BBs and central galaxies which have collapsed into a single object earlier than surviving satellites. BBs start to form stars earlier, during the peak 3/13/2011 ΛCDM, 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.
format Articulo
Articulo
author Lagos, Claudia P. del
Padilla, Nelson D.
Cora, Sofía Alejandra
author_facet Lagos, Claudia P. del
Padilla, Nelson D.
Cora, Sofía Alejandra
author_sort Lagos, Claudia P. del
title Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm
title_short Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm
title_full Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm
title_fullStr Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm
title_full_unstemmed Cosmic queuing: Galaxy satellites, building blocks and the hierarchical clustering paradigm
title_sort cosmic queuing: galaxy satellites, building blocks and the hierarchical clustering paradigm
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82725
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AT corasofiaalejandra cosmicqueuinggalaxysatellitesbuildingblocksandthehierarchicalclusteringparadigm
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