2003/05/31 by Hu Zhan
Mathematics · Physics and Astronomy · #Galaxies: Formation, Evolution, Phenomena #Stochastic processes and statistical mechanics #Theoretical and Computational Physics #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2003.06883.x
published as Mon.Not.Roy.Astron.Soc. 344 (2003) 935 · 7 pages, 9 figures, accepted for publication in MNRAS, replaced by the version after proof
arxiv created 2003/07/08 · openalex publication_date 2003/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
We report a scaling of the mean matter density with the width of the saturated Lyα absorptions. This property is established using the ‘pseudo-hydro’ technique (Croft et al.). It provides a constraint for the inversion of the Lyα forest, which encounters difficulty in the saturated region. With a Gaussian density profile and the scaling relation, a simple inversion of the simulated Lyα forests shows that the one-dimensional mass power spectrum is well recovered on scales above 2 h−1 Mpc, or roughly k≲ 0.03 km−1 s, at z= 3. The recovery underestimates the power on small scales, but improvement is possible with a more sophisticated algorithm.