Hydrodynamical Simulations of the Lyman Alpha Forest: Model Comparisons

Details Hydrodynamical Simulations of the Lyman Alpha Forest: Model Comparisons Hydrodynamical Simulations of the Lyman Alpha Forest: Model Comparisons

1999-06-17

arxiv.org/abs/astro-ph/9906297v1

Astronomy and Astrophysics

Astrophysics

37 pages, 21 figures, submitted to ApJ

Scientific paper

10.1086/308551

We investigate the properties of the Lyman alpha forest as predicted by numerical simulations for a range of currently viable cosmological models. This is done in order to understand the dependencies of the forest on cosmological parameters. Focusing on the redshift range from two to four, we show that: (1) most of the evolution in the distributions of optical depth, flux and column density can be understood by simple scaling relations, (2) the shape of optical depth distribution is a sensitive probe of the amplitude of density fluctuations on scales of a few hundred kpc, (3) the mean of the b distribution (a measure of the width of the absorption lines) is also very sensitive to fluctuations on these scales, and decreases as they increase. We perform a preliminary comparison to observations, where available. A number of other properties are also examined, including the evolution in the number of lines, the two-point flux distribution and the HeII opacity.

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