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Physical Properties, Baryon Content, and Evolution of the Lyα Forest: New Insights from High‐Resolution Observations at<i>z</i>≲ 0.4
We present a study of the Lyαforest at z<0.4 from which we conclude that at least 20% of the total baryons in the universe are located in the highly-ionized gas traced by broad Lyαabsorbers. The cool photoionized low-z intergalactic medium (IGM) probed by narrow Lyαabsorbers contains about 30% of the …