The cross-power spectrum between 21 cm emission and galaxies in hierarchical galaxy formation models
Park, J.; Kim, H.-S.; Wyithe, J.S.B.; Lacey, Cedric G.
Professor Cedric Lacey email@example.com
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 cross-power 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 changes the cross-power spectrum shape and amplitude. In particular, the feature in the cross-power spectrum corresponding to the size of ionized regions is significantly affected by supernovae feedback. We calculate predicted observational uncertainties of the cross-correlation coefficient based on specifications of the Murchison Widefield Array (MWA) combined with galaxy surveys of varying area and depth. We find that the cross-power spectrum could be detected over several square degrees of galaxy survey with galaxy redshift errors σz ≲ 0.1.
Park, J., Kim, H., Wyithe, J., & Lacey, C. G. (2014). The cross-power spectrum between 21 cm emission and galaxies in hierarchical galaxy formation models. Monthly Notices of the Royal Astronomical Society, 438(3), 2474-2482. https://doi.org/10.1093/mnras/stt2366
|Journal Article Type||Article|
|Publication Date||Mar 1, 2014|
|Deposit Date||Jun 27, 2014|
|Publicly Available Date||Jul 3, 2014|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
|Keywords||Galaxies: high-redshift, Cosmology: Theory, Dark ages, Reionization, First stars, Diffuse, Radiation.|
Published Journal Article
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
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