Tuesday, March 10
Location: UC Berkeley, Campbell Hall, 131A, 1:10 pm
Speaker: George Becker, STSCI
Title: “A Consensus Picture of Reionization?”
Abstract: When and how the intergalactic medium (IGM) became reionized carries fundamental implications for the formation of the first stars and galaxies. New results from the Planck satellite now suggest that the bulk of reionization occurred somewhat later than previously thought, potentially easing tensions with observed galaxy populations at high redshifts. A wide range of reionization histories are still allowed, however, and it is unclear whether the simplest models truly match observations. I will present new constraints on the ionizing output from galaxies and the timing of reionization based on quasar absorption line studies of the IGM over 2 < z < 7. The results help to clarify how and when reionization ended, but also pose significant challenges to current models.
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