Correlation between the Mean Matter Density and the Width of the Saturated Lyman Alpha Absorption

Details Correlation between the Mean Matter Density and the Width of the Saturated Lyman Alpha Absorption Correlation between the Mean Matter Density and the Width of the Saturated Lyman Alpha Absorption

2003-05-24

arxiv.org/abs/astro-ph/0305481v2

Mon.Not.Roy.Astron.Soc. 344 (2003) 935

Astronomy and Astrophysics

Astrophysics

7 pages, 9 figures, accepted for publication in MNRAS, replaced by the version after proof

Scientific paper

10.1046/j.1365-8711.2003.06883.x

We report a scaling of the mean matter density with the width of the saturated Lyman alpha absorptions. This property is established using the ``pseudo-hydro'' technique (Croft et al. 1998). It provides a constraint for the inversion of the Lyman alpha forest, which encounters difficulty in the saturated region. With a Gaussian density profile and the scaling relation, a simple inversion of the simulated Lyman alpha forests shows that the one-dimensional mass power spectrum is well recovered on scales above 2 Mpc/h, or roughly k < 0.03 s/km, at z=3. The recovery underestimates the power on small scales, but improvement is possible with a more sophisticated algorithm.

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