Ewald Puchwein (AIP)

Galaxies and AGN interacting with the intergalactic medium
When Aug 29, 2019 from 02:30 PM to 03:30 PM
What
  • Colloquium
Where SH Lecture Hall
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The UV and X-ray radiation emitted by high-redshift galaxy and AGN populations strongly affects the ionization state, temperature and observational properties of intergalactic gas. This allows using the intergalactic medium (IGM) as a probe of galaxy and AGN formation. At the same time photoheating of the IGM prevents its collapse into low mass halos, thereby altering galaxy formation in such objects. We use a range of cosmological hydrodynamical and radiative transfer simulations to explore these interactions, deriving, e.g., new constraints on the reionization history and the ionizing sources that drive cosmic reionization. We also investigate how the detailed ionization and thermal state of the IGM affects cosmological constraints derived from observations of the Lyman-alpha forest and 21cm signal.