The Density--Width Relation of the Saturated Lyα Absorption

Details The Density--Width Relation of the Saturated Lyα Absorption The Density--Width Relation of the Saturated Lyα Absorption

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.1905z&link_type=abstract

American Astronomical Society Meeting 202, #19.05; Bulletin of the American Astronomical Society, Vol. 35, p.725

Astronomy and Astrophysics

Astronomy

Scientific paper

We report a correlation between the mean matter density \bar ρ and the width w of the saturated Lyα absorptions, which is well characterized by \bar ρ(w)=ρ 0+a\ wb. This property is established using the pseudo-hydro technique (Croft et al. 1998). It provides a constraint for the inversion of the Lyα forest, which encounters difficulty in the saturated region. We have done a a simple inversion of the simulated Lyα forests with a Gaussian density profile. The results show that the one-dimensional mass power spectrum is well recovered on scales above 2 h-1Mpc, or, roughly k ≳ 0.03 km-1s, at z=3. The recovery underestimates the power on small scales, but improvement is possible with a more sophisticated algorithm.

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