Anne Hutter (Swinburne)

Constraints on cosmic reionization from Lyman-alpha emitters and the 21cm signal
When Jul 27, 2016 from 11:00 AM to 12:00 PM
What
  • Special Seminar
  • Colloquium
Where SH, lecture hall
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The Epoch of Reionization marks a cataclysmic event in the history of the Universe. Since reionization affects all subsequent structure formation through a number of feedback effects, it is crucial to pin down the topology of reionization. However, the exact progress of reionization and the nature of galaxies driving reionization remain open questions due to a poor understanding of the escape fraction of ionizing photons from the galaxies. Future radiointerferometers such as SKA will measure the distribution of the neutral hydrogen sensitive 21cm signal, which will allow us to derive ionization maps and their time evolution. In this talk I will present a model for high redshift galaxies during reionization and discuss constraints on galaxy properties (e.g. escape fraction of ionizing photons, dust in the ISM) and reionization from Lyman-alpha emitter observations and 21cm maps. In particular I will adress:  Which galaxies are identified as LAES and where are those located in the IGM during reionization? Can we derive constraints on reionization and its topology from 21cm and LAE data?