Ly&alpha forest absorption line parameter distributions

line parameters

Comparison between the measured neutral hydrogen column densities (upper panel) and widths (Doppler parameters; lower panel) between QSO Q1937-1009 and the predictions of numerical models. Deviations are found. The predicted line widths particularly systematically fall short of the measured widths. (From Meiksin, Bryan & Machacek 2001.)

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