Ly&alpha forest absorption line parameter distributions

line parameters

Comparison between the cumulative distributions of the neutral hydrogen column densities (upper two panels) and widths (Doppler parameters; lower two panels) measured in QSO Q1937-1009 and the predictions of numerical models. The distributions are subdivided into lines optically thin (left column) and optically thick (right column) at the line centres. The discrepancies are much more pronounced for the more ubiquitous weak (optically thin) systems than optically thick, especially for the velocity widths. (From Meiksin, Bryan & Machacek 2001.)

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