Building Blocks in Hierarchical Clustering Scenarios and their Connection with Damped Ly$α$ Systems

Details Building Blocks in Hierarchical Clustering Scenarios and their Connection with Damped Ly$α$ Systems Building Blocks in Hierarchical Clustering Scenarios and their Connection with Damped Ly$α$ Systems

2003-04-16

arxiv.org/abs/astro-ph/0304303v2

Mon.Not.Roy.Astron.Soc. 343 (2003) 959

Astronomy and Astrophysics

Astrophysics

15 pages, 11 Postscript figures. Accepted to MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06738.x

We carried out a comprehensive analysis of the chemical properties of the interstellar medium (ISM) and the stellar population (SP) of current normal galaxies and their progenitors in a hierarchical clustering scenario. We compared the results with observations of Damped Lyman-$\alpha$ systems (DLAs) under the hypothesis that, at least, part of the observed DLAs could originate in the building blocks of today normal galaxies. We used a hydrodynamical cosmological code which includes star formation and chemical enrichment. Galaxy-like objects are identified at $z=0$ and then followed back in time. Random line-of-sights (LOS) are drawn through these structures in order to mimic Damped Lyman $\alpha$ systems. We then analysed the chemical properties of the ISM and SP along the LOS. We found that the progenitors of current galaxies in the field with mean $L <0.5 L^* $ and virial circular velocity of $100-250 {\rm km/sec}$ could be the associated DLA galaxies. For these systems we detected a trend for $$ to increase with redshift.(Abridged)

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