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Astrophysics Colloquium

How to Improve Our Understanding of Cosmic Reionization
Presented by Adam Lidz
Department of Physics and Astronomy, University of Pennsylvania

Thursday, March 1, 2018
11:00 A.M. in 169-336

Abstract
An exciting frontier in observational and theoretical cosmology is the study of the first galaxies and accreting black holes. These sources emitted ultraviolet light and ionized bubbles of hydrogen gas around them, eventually filling the entire volume of the universe with ionized hydrogen in a process known as reionization. I will challenge conventional wisdom regarding one of the primary observational constraints on reionization. It is often claimed that quasar absorption spectra require reionization to complete at a redshift higher than six (z > 6). I will discuss how and why this may, in fact, be incorrect. The possibility of incomplete reionization at z < 6 is testable with current and future Lyman-alpha forest measurements: I will describe the prospects here and show some preliminary results. Finally, I will turn to upcoming redshifted 21 cm measurements from reionization, focusing on the possibilities for cross-correlating with other future data sets.

JPL Contact Tzu-Ching Chang


SVCP Astrophysics


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