The Column Density Distribution of the Lyman-Alpha Forest: A Measure of Small Scale Power

Details The Column Density Distribution of the Lyman-Alpha Forest: A Measure of Small Scale Power The Column Density Distribution of the Lyman-Alpha Forest: A Measure of Small Scale Power

1997-02-19

arxiv.org/abs/astro-ph/9702167v1

Astronomy and Astrophysics

Astrophysics

3 pages Latex file, 2 ps figures, use sprocl.sty, to appear in the Proceedings of the 18th Texas Symposium on Relativistic Ast

Scientific paper

Absorption lines in the Lyman-alpha forest can be thought of as peaks in neutral hydrogen density along lines of sight. The column density distribution (the number density of absorption lines as a function of column density) is then a statistic of density peaks, which contains information about the underlying power spectrum. In particular, we show that the slope of the distribution provides a measure of power on scales smaller than those probed by studies of present-day large scale structure.

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