We present 4 new measurements of nitrogen abundances and one upper limit in damped Ly α absorbers (DLAs) obtained by means of high resolution ($FWHM \simeq 7$ km s-1) UVES/VLT spectra. In addition to these measurements we have compiled data from all DLAs with measurements of nitrogen and α-capture elements (O, S or Si) available in the literature, including all HIRES/Keck and UVES/VLT data for a total of 32 systems, i.e. the largest sample investigated so far. We find that [ N/α] ratios are distributed in two groups: 75% of the DLAs show a mean value of $\rm [N/\alpha] = -0.87$ with a scatter of 0.17 dex, while the remaining 25% shows ratios clustered at $\rm [N/\alpha] = -1.45$ with an even lower dispersion of 0.05 dex. ...
We present chemical evolution models aimed at reproducing the observed (N/O) versus (O/H) abundance ...
Context. Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clus...
For the first time, we undertake a systematic examination of the nitrogen abundances using the NH336...
We present 4 new measurements of nitrogen abundances and one upper limit in damped Lyman alpha absor...
We take a fresh look at the abundance of nitrogen in damped Lyman α systems (DLAs) with oxygen abu...
International audienceWe take a fresh look at the abundance of nitrogen in damped Lyman alpha system...
We take a fresh look at the abundance of nitrogen in DLAs with oxygen abundances between 1/10 and 1/...
The combined enrichment of supernovae (SN) types II and I in a hierarchical clustering scenario coul...
International audienceThe abundance of nitrogen in the interstellar medium is a powerful probe of st...
We have investigated the poorly-understood origin of nitrogen in the early Galaxy by determining N ...
A remarkably small scatter in the N/O ratios for the HII regions in low-metallicity blue compact gal...
We present the results of nitrogen and oxygen abundance measurements for 185 HII regions spanning a ...
International audienceWe have investigated the poorly-understood origin of nitrogen in the early Gal...
High redshift DLA systems suggest that the relative abundances of elements might be roughly solar, a...
We present detailed spectroscopic analysis of nitrogen abundances in 31 unevolved metal-poor stars ...
We present chemical evolution models aimed at reproducing the observed (N/O) versus (O/H) abundance ...
Context. Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clus...
For the first time, we undertake a systematic examination of the nitrogen abundances using the NH336...
We present 4 new measurements of nitrogen abundances and one upper limit in damped Lyman alpha absor...
We take a fresh look at the abundance of nitrogen in damped Lyman α systems (DLAs) with oxygen abu...
International audienceWe take a fresh look at the abundance of nitrogen in damped Lyman alpha system...
We take a fresh look at the abundance of nitrogen in DLAs with oxygen abundances between 1/10 and 1/...
The combined enrichment of supernovae (SN) types II and I in a hierarchical clustering scenario coul...
International audienceThe abundance of nitrogen in the interstellar medium is a powerful probe of st...
We have investigated the poorly-understood origin of nitrogen in the early Galaxy by determining N ...
A remarkably small scatter in the N/O ratios for the HII regions in low-metallicity blue compact gal...
We present the results of nitrogen and oxygen abundance measurements for 185 HII regions spanning a ...
International audienceWe have investigated the poorly-understood origin of nitrogen in the early Gal...
High redshift DLA systems suggest that the relative abundances of elements might be roughly solar, a...
We present detailed spectroscopic analysis of nitrogen abundances in 31 unevolved metal-poor stars ...
We present chemical evolution models aimed at reproducing the observed (N/O) versus (O/H) abundance ...
Context. Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clus...
For the first time, we undertake a systematic examination of the nitrogen abundances using the NH336...