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

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

Maria E. De Rossi
(
- Buenos Aires, CONICET and
- Buenos Aires, IAFE
)
,
Patricia B. Tissera
(
- Buenos Aires, CONICET and
- Buenos Aires, IAFE
)
,
Cecilia Scannapieco
(
- Buenos Aires, CONICET and
- Buenos Aires, IAFE
)

Sep, 2006

17 pages

Published in:

Mon.Not.Roy.Astron.Soc. 374 (2007) 323-336

e-Print:

astro-ph/0609243 [astro-ph]

DOI:

10.1111/j.1365-2966.2006.11150.x

View in:

ADS Abstract Service

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Abstract: (arXiv)

We analyse the evolutionary history of galaxies formed in a hierarchical scenario consistent with the concordance

\Lambda

-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 (LZR) and the stellar mass-metallicity (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,

M_c \approx 3 \times 10^{10} M_{\odot}

, which segregates the simulated galaxy population into two distinctive groups and which remains unchanged since

z\sim 3

, with a very weak evolution of its metallicity content. The value and role played by

M_c

is consistent with the characteristic mass estimated from the SDSS galaxy survey by Kauffmann et al. (2004). Our findings suggest that systems with stellar masses smaller than

M_c

are responsible for the evolution of this relation at least from

z\approx 3

. Larger systems are stellar dominated and have formed more than 50 per cent of their stars at

z \ge 2

, showing very weak evolution since this epoch. We also found bimodal metallicity and age distributions from

z\sim3

, 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

M_c

since, from

z=3

this stellar mass is found in systems with circular velocities larger than 100 \kms.

galaxies: abundances
galaxies: evolution
galaxies: formation
cosmology: theory

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