The cross-power spectrum between 21 cm emission and galaxies in hierarchical galaxy formation models
Jaehong Park, Han-Seek Kim, J Stuart B Wyithe, CG Lacey
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2014
The correlation between 21 cm fluctuations and galaxies is sensitive to the astrophysical properties of the galaxies that drove reionization. Thus, detailed measurements of the crosspower spectrum and its evolution could provide a powerful measurement of both the properties of early galaxies and the process of reionization. In this paper, we study the evolution of the cross-power spectrum between 21 cm 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 find that inclusion of different feedback processes ch..View full abstract
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Awarded by Science and Technology Facilities Council
HSK is supported by a Super-Science Fellowship from the Australian Research Council. JSBW acknowledges the support of an Australian Research Council Laureate Fellowship. The Centre for All-sky Astrophysics is an Australian Research Council Centre of Excellence, funded by grant CE110001020. This work was supported in part by the Science and Technology Facilities Council rolling grant ST/I001166/1 to the ICC. The Millennium II Simulation was carried out by the Virgo Consortium at the supercomputer centre of the Max Planck Society in Garching. Calculations for this paper were partly performed on the ICC Cosmology Machine, which is part of the DiRAC Facility jointly funded by STFC, the Large Facilities Capital Fund of BIS and Durham University.