The richness dependence of galaxy cluster correlations: results from a redshift survey of rich APM clusters

被引:84
作者
Croft, RAC
Dalton, GB
Efstathiou, G
Sutherland, WJ
Maddox, SJ
机构
[1] OHIO STATE UNIV, DEPT ASTRON, COLUMBUS, OH 43210 USA
[2] ROYAL GREENWICH OBSERV, CAMBRIDGE CB3 0EZ, ENGLAND
关键词
galaxies: clusters: general; cosmology: miscellaneous; large-scale structure of Universe;
D O I
10.1093/mnras/291.2.305
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyse the spatial clustering properties of a new catalogue of very rich galaxy clusters with newly measured redshifts selected from the APM Galaxy Survey. These clusters are of comparable richness and space density to Abell richness class greater than or equal to 1 clusters, but selected using an objective algorithm from a catalogue demonstrably free of artificial inhomogeneities. Evaluation of the two-point correlation function xi(cc)(r) for the full sample and for richer subsamples reveals that the correlation amplitude is consistent with that measured for lower richness APM clusters and X-ray selected clusters. We apply a maximum likelihood estimator to find the best-fitting slope and amplitude of a power-law fit to xi(cc)(r), and to estimate the correlation length r(0) [the value of r at which xi(cc)(r) is equal to unity]. For clusters with a mean space density of 1.6 x 10(-6) h(3) Mpc(-3) (equivalent to the space density of Abell richness greater than or equal to 2 clusters), we find r(0) = 21.3(-9.3)(+11.1) h(-1) Mpc (95 per cent confidence limits). This is consistent with the weak richness dependence of xi(cc)(r) expected in Gaussian models of structure formation. In particular, the amplitude of xi(cc)(r) at all richnesses matches that of xi(cc)(r) for clusters selected in N-body simulations of a low-density cold dark matter model.
引用
收藏
页码:305 / 313
页数:9
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