Exploring the Lyman Forest with VLT/UVES

Details Exploring the Lyman Forest with VLT/UVES Exploring the Lyman Forest with VLT/UVES

2001-09-19

arxiv.org/abs/astro-ph/0109305v1

Astronomy and Astrophysics

Astrophysics

4 pages Latex, with 2 PostScript figures, to appear in the Proceedings of the Meeting on Gaseous Matter in Galactic and Interg

Scientific paper

A sample of 8 QSOs with 1.7 < z_em < 3.7 has been observed with VLT/UVES at a typical resolution 45000 and S/N~40-50. Thanks to the two-arm design of the spectrograph, a remarkable efficiency has been achieved below 400nm and above 800nm, which translates immediately in the possibility of obtaining new results, especially at z<2.5. We report here new insight gained about the evolution of the number density of Ly-a lines, their column density distribution, the ionizing UV background and the cosmic baryon density.

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