The Nitrogen and Oxygen abundances in the neutral gas at high redshift

Details The Nitrogen and Oxygen abundances in the neutral gas at high redshift The Nitrogen and Oxygen abundances in the neutral gas at high redshift

2007-12-17

arxiv.org/abs/0712.2760v1

Astronomy and Astrophysics

Astrophysics

11 pages, 10 Postscript figures

Scientific paper

10.1051/0004-6361:20078607

We study the Oxygen and Nitrogen abundances in the interstellar medium of high-redshift galaxies. We use high resolution and high signal-to-noise ratio spectra of Damped Lyman-alpha (DLA) systems detected along the line-of-sight to quasars to derive robust abundance measurements from unsaturated metal absorption lines. We present results for a sample of 16 high-redshift DLAs and strong sub-DLAs (log N(HI)>19.5, 2.4-1 and nine systems have [N/O]<-1.15. In the diagram [N/O] versus [O/H], a loose plateau is possibly present at [N/O]=-0.9 that is below the so-called primary plateau as seen in local metal-poor dwarf galaxies ([N/O] in the range -0.57 to -0.74). No system is seen above this primary plateau whereas the majority of the systems lie well below with a large scatter. All this suggests a picture in which DLAs undergo successive star-bursts. During such an episode, the [N/O] ratio decreases sharply because of the rapid release of Oxygen by massive stars whereas inbetween two bursts, Nitrogen is released by low and intermediate-mass stars with a delay and the [N/O] ratio increases.

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