Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models

We use cosmological hydrodynamical simulations including star formation and metal enrichment to study the evolution of the chemical properties of galaxy-like objects at high redshift in the range 0.25 < z < 2.35 in a hierarchical clustering scenario. We find that as the galactic objects are as...

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Autores principales: Tissera, P.B., Lambas, D.G., Mosconi, M.B., Cora, S.
Formato: JOUR
Materias:
Cosmology: Theory
Dark matter
Galaxies: Abundances
Galaxies: Evolution
Galaxies: Formation
Methods: Numerical
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v557_n2PART1_p527_Tissera
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0004637X_v557_n2PART1_p527_Tissera2023-10-03T14:01:49Z Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models Tissera, P.B. Lambas, D.G. Mosconi, M.B. Cora, S. Cosmology: Theory Dark matter Galaxies: Abundances Galaxies: Evolution Galaxies: Formation Methods: Numerical We use cosmological hydrodynamical simulations including star formation and metal enrichment to study the evolution of the chemical properties of galaxy-like objects at high redshift in the range 0.25 < z < 2.35 in a hierarchical clustering scenario. We find that as the galactic objects are assembled, their gaseous components exhibit neutral hydrogen column densities with abundances and scatter comparable to those observed in damped Lyα systems (DLAs). The unweighted mean of abundance ratios and least-square linear regressions through the simulated DLAs yield intrinsic metallicity evolution for [Zn/H] and [Fe/H] consistent with results obtained from similar analyses of available observations. Our model statistically reproduces the mild evolution detected in the metallicity of the neutral hydrogen content of the universe, given by mass-weighted means, if observational constraints are considered (as suggested in 1998 by Boissée and co-workers). For the α-elements in the simulated DLAs, we find neither enhancement nor dependence on metallicity. Our results support the hypotheses that DLAs trace a variety of galactic objects with different formation histories and that both Type I and Type II supernovae are contributing to the chemical enrichment of the gas component, at least since z ≈ 2. This study indicates that DLAs could be understood as the building blocks that merged to form current normal galaxies within a hierarchical clustering scenario. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v557_n2PART1_p527_Tissera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmology: Theory
Dark matter
Galaxies: Abundances
Galaxies: Evolution
Galaxies: Formation
Methods: Numerical
spellingShingle Cosmology: Theory
Dark matter
Galaxies: Abundances
Galaxies: Evolution
Galaxies: Formation
Methods: Numerical
Tissera, P.B.
Lambas, D.G.
Mosconi, M.B.
Cora, S.
Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models
topic_facet Cosmology: Theory
Dark matter
Galaxies: Abundances
Galaxies: Evolution
Galaxies: Formation
Methods: Numerical
description We use cosmological hydrodynamical simulations including star formation and metal enrichment to study the evolution of the chemical properties of galaxy-like objects at high redshift in the range 0.25 < z < 2.35 in a hierarchical clustering scenario. We find that as the galactic objects are assembled, their gaseous components exhibit neutral hydrogen column densities with abundances and scatter comparable to those observed in damped Lyα systems (DLAs). The unweighted mean of abundance ratios and least-square linear regressions through the simulated DLAs yield intrinsic metallicity evolution for [Zn/H] and [Fe/H] consistent with results obtained from similar analyses of available observations. Our model statistically reproduces the mild evolution detected in the metallicity of the neutral hydrogen content of the universe, given by mass-weighted means, if observational constraints are considered (as suggested in 1998 by Boissée and co-workers). For the α-elements in the simulated DLAs, we find neither enhancement nor dependence on metallicity. Our results support the hypotheses that DLAs trace a variety of galactic objects with different formation histories and that both Type I and Type II supernovae are contributing to the chemical enrichment of the gas component, at least since z ≈ 2. This study indicates that DLAs could be understood as the building blocks that merged to form current normal galaxies within a hierarchical clustering scenario.
format JOUR
author Tissera, P.B.
Lambas, D.G.
Mosconi, M.B.
Cora, S.
author_facet Tissera, P.B.
Lambas, D.G.
Mosconi, M.B.
Cora, S.
author_sort Tissera, P.B.
title Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models
title_short Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models
title_full Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models
title_fullStr Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models
title_full_unstemmed Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models
title_sort chemical enrichment at high redshifts: understanding the nature of damped lyα systems in hierarchical models
url http://hdl.handle.net/20.500.12110/paper_0004637X_v557_n2PART1_p527_Tissera
work_keys_str_mv AT tisserapb chemicalenrichmentathighredshiftsunderstandingthenatureofdampedlyasystemsinhierarchicalmodels
AT lambasdg chemicalenrichmentathighredshiftsunderstandingthenatureofdampedlyasystemsinhierarchicalmodels
AT mosconimb chemicalenrichmentathighredshiftsunderstandingthenatureofdampedlyasystemsinhierarchicalmodels
AT coras chemicalenrichmentathighredshiftsunderstandingthenatureofdampedlyasystemsinhierarchicalmodels
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