Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-02-10
Mon.Not.Roy.Astron.Soc. 282 (1996) 1096
Astronomy and Astrophysics
Astrophysics
Latex, 25 pages (including 8 PS figures). The PS-file of the paper is also available via anonymous ftp at: ftp://ibm-3.mpa-g
Scientific paper
We show that if a sample of galaxy clusters is complete above some mass threshold, then hierarchical clustering theories for structure formation predict its autocorrelation function to be determined purely by the cluster abundance and by the spectrum of linear density fluctuations. Thus if the shape of the initial fluctuation spectrum is known, its amplitude $\sigma_8$ can be estimated directly from the correlation length of a cluster sample in a way which is independent of the value of $\Omega_0$. If the cluster mass corresponding to the sample threshold is also known, it provides an independent estimate of the quantity $\sigma_8\Omega_0^{0.6}$. Thus cluster data should allow both $\sigma_8$ and $\Omega_0$ to be determined observationally. We explore these questions using N-body simulations together with a simple but accurate analytical model based on extensions of Press-Schechter theory. Applying our results to currently available data we find that if the linear fluctuation spectrum has a shape similar to that suggested by the APM galaxy survey, then a correlation length $r_0$ in excess of $20\mpch$ for Abell clusters would require $\sigma_8>1$, while $r_0<15\mpch$ would require $\sigma_8<0.5$. With conventional estimates of the relevant mass threshold these imply $\Omega_0\la 0.3$ and $\Omega_0\ga 1$ respectively.
Jing Yi-Peng
Mo Hou-Jun
White Simon D. M.
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