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Artículo

Clues for the origin of the fundamental metallicity relations - I. The hierarchical building up of the structure

de Rossi, Maria EmiliaIcon ; Tissera, Patricia BeatrizIcon ; Scannapieco, CeciliaIcon
Fecha de publicación: 01/2007
Editorial: Oxford University Press
Revista: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We analyse the evolutionary history of galaxies formed in a hierarchical scenario consistent with the concordance Lambda cold dark matter (CDM) model focusing on the study of the relation between their chemical and dynamical properties. Our simulations consistently describe the formation of the structure and its chemical enrichment within a cosmological context. Our results indicate that the luminosity–metallicity and the stellar mass–metallicity (LZR and MZR) relations are naturally generated in a hierarchical scenario. Both relations are found to evolve with redshift. In the case of the MZR, the estimated evolution is weaker than that deduced from observational works by approximately 0.10 dex. We also determine a characteristic stellar mass, Mc ≈ 3 × 1010 M⊙, which segregates the simulated galaxy population into two distinctive groups and which remains unchanged since z ∼ 3, with a very weak evolution of its metallicity content. The value and role played by Mc is consistent with the characteristic mass estimated from the SDSS galaxy survey by Kauffmann et al. Our findings suggest that systems with stellar masses smaller than Mc are responsible for the evolution of this relation at least from z ≈ 3. Larger systems are stellar dominated and have formed more than 50 per cent of their stars at z 2, showing very weak evolution since this epoch. We also found bimodal metallicity and age distributions from z ∼ 3, which reflects the existence of two different galaxy populations. Although SN feedback may affect the properties of galaxies and help to shape the MZR, it is unlikely that it will significantly modify Mc since, from z = 3 this stellar mass is found in systems with circular velocities larger than 100 km s −1
Palabras clave: Galaxies:Abundances , Galaxies:Evolution , Galaxies:Formation , Cosmology:Theory
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/21999
URL: http://mnras.oxfordjournals.org/content/374/1/323
DOI: http://dx.doi.org/10.1111/j.1365-2966.2006.11150.x
URL: https://arxiv.org/abs/astro-ph/0609243
Colecciones
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
de Rossi, Maria Emilia; Tissera, Patricia Beatriz; Scannapieco, Cecilia; Clues for the origin of the fundamental metallicity relations - I. The hierarchical building up of the structure; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 374; 1; 1-2007; 323-336
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