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Early stages of nitrogen enrichment in galaxies: Clues from measurements in damped Lyman αsystems
Astronomy and Astrophysics
We present 4 new measurements of nitrogen abundances and one upper limit in damped Lyman alpha absorbers (DLAs) obtained by means of high resolution (FWHM \~ 7 km/s) UVES/VLT spectra. In addition to these measurements we have compiled data from all DLAs with measurements of nitrogen and alpha-capture elements (O, S or Si) available in the literature, including all HIRES/Keck and UVES/VLT data for a total of 33 systems, i.e. the largest sample investigated so far. We find that [N/alpha] ratiosdoi:10.1051/0004-6361:20030273 fatcat:slmgr2uqvjcsnfsecbdfizhan4