Cosmological redshift distortion: deceleration, bias and density parameters from future redshift surveys of galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

9 pages, 5 figs, aastex, ApJ in press, replaced version includes minor corrections

Scientific paper

10.1086/305197

The observed two-point correlation functions of galaxies in redshift space become anisotropic due to the geometry of the universe as well as due to the presence of the peculiar velocity field. On the basis of linear perturbation theory, we expand the induced anisotropies of the correlation functions with respect to the redshift $z$, and obtain analytic formulae to infer the deceleration parameter $q_0$, the density parameter $\Omega_0$ and the derivative of the bias parameter $d\ln b/dz$ at $z=0$ in terms of the observable statistical quantities. The present method does not require any assumption of the shape and amplitude of the underlying fluctuation spectrum, and thus can be applied to future redshift surveys of galaxies including the Sloan Digital Sky Survey. We also evaluate quantitatively the systematic error in estimating the value of $\beta_0 \equiv \Omega_0^{0.6}/b$ from a galaxy redshift survey on the basis of a conventional estimator for $\beta_0$ which neglects both the geometrical distortion effect and the time evolution of the parameter $\beta(z)$. If the magnitude limit of the survey is as faint as 18.5 (in B-band) as in the case of the Sloan Digital Sky Survey, the systematic error ranges between -20% and 10% depending on the cosmological parameters. Although such systematic errors are smaller than the statistical errors in the current surveys, they will dominate the expected statistical error for future surveys.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Cosmological redshift distortion: deceleration, bias and density parameters from future redshift surveys of galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cosmological redshift distortion: deceleration, bias and density parameters from future redshift surveys of galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological redshift distortion: deceleration, bias and density parameters from future redshift surveys of galaxies will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-552535

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.