Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario

The combined enrichment of supernovae (SN) types II and I in a hierarchical clustering scenario could produce regions with low N content with respect to α elements, consistent with observed values measured in damped Lyman α systems (DLAs). We have studied the formation of DLAs in a hierarchical clus...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Tissera, Patricia Beatriz, Lambas, Diego G., Cora, Sofía Alejandra, Mosconi, Mirta B.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Astronómicas
Cosmology: theory
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84962
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84962
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Cosmology: theory
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
spellingShingle Ciencias Astronómicas
Cosmology: theory
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
Tissera, Patricia Beatriz
Lambas, Diego G.
Cora, Sofía Alejandra
Mosconi, Mirta B.
Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario
topic_facet Ciencias Astronómicas
Cosmology: theory
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
description The combined enrichment of supernovae (SN) types II and I in a hierarchical clustering scenario could produce regions with low N content with respect to α elements, consistent with observed values measured in damped Lyman α systems (DLAs). We have studied the formation of DLAs in a hierarchical clustering scenario under the hypothesis that the building blocks of current field galaxies could be part of the structures mapped by DLAs. In our models the effects of the non-linear evolution of the structure (which produces bursty star formation histories, gas infall, etc.) and the contributions of SNIa and SNII are found to be responsible of producing these N regions with respect to the α elements. Although SNIa are not main production sites for Si or O, because of the particular timing between SNIa and SNII, their contributions can help to produce clouds with such abundances. Consistently, we found the simulated low nitrogen DLAs to have subsolar [Fe/H]. We show that low nitrogen DLAs have experienced important star formation activity in the past with higher efficiency than normal DLAs. Our chemical model suggests that SNIa play a relevant role in the determination of the abundance pattern of DLA and, that the observed low nitrogen DLA frequency could be explained taking into account the time-delay of ≈0.5 Gyr introduced by these supernova to release metals.
format Articulo
Articulo
author Tissera, Patricia Beatriz
Lambas, Diego G.
Cora, Sofía Alejandra
Mosconi, Mirta B.
author_facet Tissera, Patricia Beatriz
Lambas, Diego G.
Cora, Sofía Alejandra
Mosconi, Mirta B.
author_sort Tissera, Patricia Beatriz
title Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario
title_short Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario
title_full Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario
title_fullStr Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario
title_full_unstemmed Nitrogen abundances in damped Lyman α systems: the combined effects of SNII and SNIa in a hierarchical clustering scenario
title_sort nitrogen abundances in damped lyman α systems: the combined effects of snii and snia in a hierarchical clustering scenario
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/84962
work_keys_str_mv AT tisserapatriciabeatriz nitrogenabundancesindampedlymanasystemsthecombinedeffectsofsniiandsniainahierarchicalclusteringscenario
AT lambasdiegog nitrogenabundancesindampedlymanasystemsthecombinedeffectsofsniiandsniainahierarchicalclusteringscenario
AT corasofiaalejandra nitrogenabundancesindampedlymanasystemsthecombinedeffectsofsniiandsniainahierarchicalclusteringscenario
AT mosconimirtab nitrogenabundancesindampedlymanasystemsthecombinedeffectsofsniiandsniainahierarchicalclusteringscenario
bdutipo_str Repositorios
_version_ 1764820488770551808

Ejemplares similares