Oral Presentation Astronomical Society of Australia Annual Scientific Meeting including HWWS 2013

The cross-power spectrum between 21cm emission and galaxies in hierarchical galaxy formation models. (#44)

Jaehong Park 1
  1. The University of Melbourne, Parkville, VIC, Australia

The correlation between 21cm fluctuations and galaxies is sensitive to the astrophysical properties of the galaxies that drove reionization. Thus, detailed measurements of the cross-power spectrum and its evolution could provide a powerful measurement both of the properties of early galaxies and the process of reionization. We will present the evolution of the cross-power spectrum between 21cm emission and galaxies using a model which combines the hierarchical galaxy formation model GALFORM implemented within the Millennium-II dark matter simulation, with a semi-numerical scheme to describe the resulting ionization structure. We will also show predicted observational uncertainties of the cross-correlation coefficient based on specifications of the Murchison Widefield Array combined with galaxy surveys of varying area and depth.