The damped Lyman Alpha absorber toward Q0913+072

Details The damped Lyman Alpha absorber toward Q0913+072 The damped Lyman Alpha absorber toward Q0913+072

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004bdmh.confe..96e&link_type=abstract

"Proceedings of "Baryons in Dark Matter Halos". Novigrad, Croatia, 5-9 Oct 2004. Editors: R. Dettmar, U. Klein, P. Salucci. Publ

Physics

Scientific paper

We present a detailed analysis of chemical abundances in a damped Lyman α absorber at zabs = 2.618 toward the quasar Q0913+072 (zem = 2.785) using public UVES/VLT high resolution data. The total hydrogen column density is log N(H I)=20.39. We find a very low overall metallicity where the detected species include H I, O I, C II, Fe II, Al II, and Si II. Upper limits can be given for Fe III, Si III, Al III, Mg II, S II, S III, N I, N II, N III, C IV, Si IV, and molecular hydrogen. The system is very deficient in carbon ([C/H]=-2.91), nitrogen ([N/H]≤ -3.69) and oxygen ([O/H]=-2.47), representing one of the few DLA systems where the CNO-elements can be measured accurately. Direct measurements of O I and upper limits for N I, as well as N II and N III, imply [N/O] -1.22. Thus, we are looking at a chemically juvenile DLA system, possibly only enriched by the first generation of stars. Plotting the [N/Si] versus [N/H] ratios supports the idea of a common nitrogen ground floor for DLAs at [N/Si]≈ -1.5, indicating a primary nitrogen production by Pop III stars, due to the explosion as Type II Supernovae.

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