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

Patricia B. Tissera, Diego G. Lambas, Sofia A. Cora, Mirta B. Mosconi

Resultado de la investigación: Article

2 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen337
N.º3
DOI
EstadoPublished - 11 dic 2002

Huella dactilar

nitrogen
supernovae
star formation
time lag
time measurement
histories
galaxies
metal
history
gases
gas
metals
effect
chemical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

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Nitrogen abundances in damped Lyman a systems : The combined effects of SNII and SNIa in a hierarchical clustering scenario. / Tissera, Patricia B.; Lambas, Diego G.; Cora, Sofia A.; Mosconi, Mirta B.

En: Monthly Notices of the Royal Astronomical Society, Vol. 337, N.º 3, 11.12.2002.

Resultado de la investigación: Article

TY - JOUR

T1 - Nitrogen abundances in damped Lyman a systems

T2 - The combined effects of SNII and SNIa in a hierarchical clustering scenario

AU - Tissera, Patricia B.

AU - Lambas, Diego G.

AU - Cora, Sofia A.

AU - Mosconi, Mirta B.

PY - 2002/12/11

Y1 - 2002/12/11

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AB - 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.

KW - Cosmology: theory

KW - Galaxies: abundances

KW - Galaxies: evolution

KW - Galaxies: formation

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