Correlation between the mean matter density and the width of the saturated Lyα absorption
Abstract
We report a scaling of the mean matter density with the width of the saturated Lyα absorptions. This property is established using the `pseudohydro' 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 onedimensional 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.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 September 2003
 DOI:
 10.1046/j.13658711.2003.06883.x
 arXiv:
 arXiv:astroph/0305481
 Bibcode:
 2003MNRAS.344..935Z
 Keywords:

 quasars: absorption lines;
 cosmology: theory;
 largescale structure of Universe;
 Astrophysics
 EPrint:
 7 pages, 9 figures, accepted for publication in MNRAS, replaced by the version after proof