Determination of the Baryon Density from Large Scale Galaxy Redshift Surveys

Details Determination of the Baryon Density from Large Scale Galaxy Redshift Surveys Determination of the Baryon Density from Large Scale Galaxy Redshift Surveys

1997-07-17

arxiv.org/abs/astro-ph/9707209v1

Astrophys.J.495:29,1998

Astronomy and Astrophysics

Astrophysics

23 Pages, 10 Postscript figures

Scientific paper

10.1086/305284

We estimate the degree to which the baryon density, $\Omega_{b}$, can be determined from the galaxy power spectrum measured from large scale galaxy redshift surveys, and in particular, the Sloan Digital Sky Survey. A high baryon density will cause wiggles to appear in the power spectrum, which should be observable at the current epoch. We assume linear theory on scales $\geq 20h^{-1}Mpc$ and do not include the effects of redshift distortions, evolution, or biasing. With an optimum estimate of $P(k)$ to $k\sim 2\pi/(20 h^{-1} Mpc)$, the $1 \sigma$ uncertainties in $\Omega_{b}$ are roughly 0.07 and 0.016 in flat and open ($\Omega_{0}=0.3$) cosmological models, respectively. This result suggests that it should be possible to test for consistency with big bang nucleosynthesis estimates of $\Omega_{b}$ if we live in an open universe.

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