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The N/O evolution on galaxies:the role played by the star formation history | | Mercedes Mollá
; José M. Vílchez
; Angeles I. Díaz
; Marta Gavilán
; | | Date: |
24 Jan 2007 | | Abstract: | We study the evolution of nitrogen resulting from a set of spiral and irregular galaxy models computed for a large number of input mass radial distributions and with various star formation efficiencies. We show that our models produce a nitrogen abundance evolution in good agreement with the observational data. In particular, low N/O values for high-redshift objects, such as those obtained for Damped Lyman Alpha galaxies can be obtained with our models simultaneously to higher and constant values of N/O as those observed for irregular and dwarf galaxies, at the same low oxygen abundances $
m 12+log(O/H) sim 7$ dex. The differences in the star formation histories of the regions and galaxies modeled are essential to reproduce the observational data in the N/O-O/H plane. | | Source: | arXiv, astro-ph/0701691 | | Services: | Forum | Review | PDF | Favorites | |
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