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The correlation function of galaxy clusters and detection of baryon acoustic oscillations | | T. Hong
; J. L. Han
; Z. L. Wen
; L. Sun
; H. Zhan
; | | Date: |
3 Feb 2012 | | Abstract: | We calculate the correlation function of 13,904 galaxy clusters of z leq 0.4
selected from the cluster catalog of Wen, Han & Liu. The correlation function
can be fitted with a power-law model xi(r)=(r/R_0)^{gamma} on the scales of
10h^(-1)Mpc leq r leq 50h^(-1)Mpc, with a larger correlation length of
R_0=18.84pm0.27 h^(-1)Mpc for clusters with a richness of R geq 15 and a
smaller length of R_0=16.15 pm 0.13 h^(-1)Mpc for clusters with a richness of
R geq 5. The power law index of gamma=2.1 is found to be almost the same for
all cluster subsamples. A pronounced baryon acoustic oscillations (BAO) peak is
detected at r ~ 110 h^(-1)Mpc with a significance of ~ 1.9sigma. By analyzing
the correlation function in the range of 20 h^(-1)Mpc leq r leq 200
h^(-1)Mpc, we find the constraints on distance parameters are
D_v(0.276)=1077pm55(1sigma) Mpc and h=0.73 pm 0.039 (1sigma), which are
consistent with the WMAP 7-year cosmology. However, the BAO signal from the
cluster sample is stronger than expected and leads to a rather low matter
density Omega_m h^2=0.093pm0.0077 (1sigma), which deviates from the WMAP
7-year result by more than 3 sigma. The correlation function of the GMBCG
cluster sample is also calculated and our detection of the BAO feature is
confirmed. | | Source: | arXiv, 1202.0640 | | Services: | Forum | Review | PDF | Favorites | |
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