Evidence for Small-Scale Clustering in a Column-Density--limited Sample of the Lyman-Alpha Forest

Details Evidence for Small-Scale Clustering in a Column-Density--limited Sample of the Lyman-Alpha Forest Evidence for Small-Scale Clustering in a Column-Density--limited Sample of the Lyman-Alpha Forest

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...440..431c&link_type=abstract

Astrophysical Journal v.440, p.431

Astronomy and Astrophysics

Astronomy

29

Galaxies: Clusters: General, Cosmology: Large-Scale Structure Of Universe, Galaxies: Quasars: Absorption Lines

Scientific paper

We have analyzed the clustering properties of Lyα forest lines in an H I column-density-limited sample over the redshift range z = 2.7-3.7. The sample has a relatively large lower cutoff column density (Nc ≥ 1014 cm-2) and is based on published high resolution spectra of three distant QSOs (0014 + 813, 0420-388, 2000-330). Two statistical tools (distribution of line intervals and two-point correlation function) were applied to reveal the presence of small-scale clustering with velocity splitting ˜50-150 km s-1 at better than the 3 σ level. The importance of such clustering for theoretical models of the Lyα forest is briefly discussed.

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