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Galaxy surveys, inhomogeneous re-ionization and dark energy

Pritchard, Jonathan R. and Furlanetto, Steven R. and Kamionkowski, Marc (2007) Galaxy surveys, inhomogeneous re-ionization and dark energy. Monthly Notices of the Royal Astronomical Society, 374 (1). pp. 159-167. ISSN 0035-8711. doi:10.1111/j.1365-2966.2006.11131.x.

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We examine the effect of inhomogeneous re-ionization on the galaxy power spectrum and the consequences for probing dark energy. To model feedback during re-ionization, we apply an ansatz setting the galaxy overdensity proportional to the underlying ionization field. Thus, inhomogeneous re-ionization may leave an imprint in the galaxy power spectrum. We evolve this imprint to low redshift and use the Fisher-matrix formalism to assess the effect on parameter estimation. We show that a combination of low-redshift (z= 0.3) and high-redshift (z= 3) galaxy surveys can constrain the size of cosmological H ii regions during re-ionization. This imprint can also cause confusion when using baryon oscillations or other features of the galaxy power spectrum to probe the dark energy. We show that when bubbles are large, and hence detectable, our ability to constrain w can be degraded by up to 50 per cent. When bubbles are small, the imprint has little or no effect on measuring dark energy parameters.

Item Type:Article
Related URLs:
URLURL TypeDescription
Furlanetto, Steven R.0000-0002-0658-1243
Kamionkowski, Marc0000-0001-7018-2055
Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2006 September 29. Received 2006 September 26; in original form 2006 April 18. Published Online: 28 November 2006. This work was supported at Caltech in part by DoE DE-FG03-92-ER40701 and NASA NNG05GF69G.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Subject Keywords:galaxies: formation • intergalactic medium • cosmological parameters • cosmology: theory
Issue or Number:1
Record Number:CaltechAUTHORS:PRImnras07a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12973
Deposited By: Archive Administrator
Deposited On:13 Jan 2009 00:51
Last Modified:08 Nov 2021 22:34

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