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Published January 2007 | Published
Journal Article Open

Galaxy surveys, inhomogeneous re-ionization and dark energy


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.

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.

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