The Correlation Function and Detection of Baryon Acoustic Oscillation Peak from the Spectroscopic SDSS GalWCat Galaxy Cluster Catalogue

Abstract

We measure the two point correlation function (CF) of 1357 galaxy clusters with a mass of ${\log }_{10}{M}_{200}\ge 13.6$~\hm~and at a redshift of $z\le 0.125$. This work differs from previous analyses in that it utilizes a spectroscopic cluster catalogue, $\mathtt{SDSS}-\mathtt{GalWCat}$, to measure the CF and detect the baryon acoustic oscillation (BAO) signal. Unlike previous studies which use statistical techniques, we compute covariance errors directly by generating a set of 1086 galaxy cluster lightcones from the GLAM $N$-body simulation. Fitting the CF with a power-law model of the form $\xi (s)=(s/s_0{)}^{-\gamma }$, we determine the best-fit correlation length and power-law index at three mass thresholds. We find that the correlation length increases with increasing the mass threshold while the power-law index is almost constant. For ${\log }_{10}{M}_{200}\ge 13.6$~\hm, we find $s_0=14.54\pm 0.87$~\h~and $\gamma =1.97\pm 0.11$. We detect the BAO signal at $s=100$~\h~with a significance of $1.60\sigma$. Fitting the CF with a $\Lambda$CDM model, we find $D_{\mathrm{V}}(z=0.089){\mathrm{r}}_d^{fid}/{\mathrm{r}}_d=267.62\pm 26$ \h, consistent with Planck 2015 cosmology. We present a set of 108 high-fidelity simulated galaxy cluster lightcones from the high-resolution \U~N-body simulation, employed for methodological validation. We find $D_{\mathrm{V}}(z=0.089)/r_d=2.666\pm 0.129$, indicating that our method does not introduce any bias in the parameter estimation for this small sample of galaxy clusters.

arXiv comment7 pages, 5 figures

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