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Thousands of Milky Ways: galaxy satellites and building blocks

Published online by Cambridge University Press:  13 April 2010

Nelson Padilla ,
Claudia Lagos  and
Sofía Cora
Nelson Padilla
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl
Claudia Lagos
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl
Sofía Cora
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas de la Universidad Nacional de La Plata, and Instituto de Astrofísica de La Plata, (CCT La Plata, CONICET, UNLP), Observatorio Astronómico, Paseo del Bosque S/N, 1900 La Plata, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia 1917, Buenos Aires, Argentina
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Abstract

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A semi-analytic model of galaxy formation with and without active galactic nuclei feedback is used to study the nature of possible building blocks (BBs) of z = 0 galaxies, including those of Milky-Way types. We find that BBs can show an important range of properties arising from environmental variables such as host halo mass, and whether a galaxy is a satellite within its host halo; the stellar formation histories are comparatively faster and the chemical enrichment is more efficient in BBs than in surviving satellites, in accordance with recent metallicity measurements for the Milky Way. These results can be used in combination with observational constraints to continue probing the ability of the cold dark-matter scenario to reproduce the history of galaxy demography in the Universe.

Keywords

methods: N-body simulationsGalaxy: evolutionGalaxy: formationGalaxy: halogalaxies: evolutiongalaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 240 - 243
Copyright
Copyright © International Astronomical Union 2010

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