QSO Absorption Lines as a Cosmological Probe: Exploring the Lyman Forest with VLT/UVES
Journal
Date Issued
2003
Author(s)
Abstract
The remarkable efficiency of the Ultra-Violet Echelle Spectrograph (UVES) at the VLT has made it possible to push high-resolution, high-S/N ground observations of the Lyα forest down to z ∼ 1.5, gaining new insight into the physical state of the intergalactic medium (IGM) and its evolution over more than 90% of the cosmic time. The results presented here are based on recent UVES observations of the spectra of 8 QSOs, covering the Lyα forest at 1.5 < z_{Lyα} < 3.6 with S/N ∼ 40-50 and resolution R ∼ 45000 [1,2]. The absorption lines were fit to the Voigt profiles to derive the three line parameters: absorption redshift, z, the HI column density, N HI in cm-2, and the Doppler parameters, b in km s-1.
Coverage
Astronomy, Cosmology and Fundamental Physics Proceedings of the ESO/CERN/ESA Symposium
All editors
Shaver, Peter A.; Di Lella, Luigi; Giménez, Alvaro
Series
Start page
417
Conferenece
Astronomy, Cosmology and Fundamental Physics
Conferenece place
Garching, Germany
Conferenece date
4-7 March, 2002
Issn Identifier
1431-2433
Ads BibCode
2003acfp.conf..417B
Rights
open.access
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