Skip to main content

Research Repository

Advanced Search

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.

The cross-power spectrum between 21 cm emission and galaxies in hierarchical galaxy formation models Thumbnail


Authors

J. Park

H.-S. Kim

J.S.B. Wyithe



Abstract

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.

Citation

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 Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 438
Issue 3
Pages 2474-2482
DOI https://doi.org/10.1093/mnras/stt2366
Keywords Galaxies: high-redshift, Cosmology: Theory, Dark ages, Reionization, First stars, Diffuse, Radiation.
Publisher URL http:/dx.doi.org/10.1093/mnras/stt2366

Files

Published Journal Article (1.2 Mb)
PDF

Copyright Statement
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.





You might also like



Downloadable Citations