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The KPNO/Deeprange Distant Cluster Survey: I. The Catalog & the Space Density of Intermediate Redshift Clusters | | Marc Postman
; Tod R. Lauer
; William Oegerle
; Megan Donahue
; | | Date: |
29 May 2002 | | Journal: | Astrophys.J. 579 (2002) 93-126 | | Subject: | astro-ph | | Affiliation: | STScI), Tod R. Lauer (NOAO), William Oegerle (NASA/GSFC), Megan Donahue (STScI | | Abstract: | We have conducted an automated search for galaxy clusters within a contiguous 16 square degree I-band survey in the north Galactic hemisphere. A matched filter detection algorithm identifies 444 cluster candidates in the range 0.2 <= z <= 1.2. The full catalog is presented along with the results from a follow-up spectroscopic survey. The estimated redshift distribution of the cluster candidates is consistent with a constant comoving density over the range 0.2 <= z_est <= 0.8. A decline in the cluster space density by more than a factor of 3 over this redshift range is rejected at >99.9% confidence level. We find that the space density of Lambda_CL >= 40 clusters in our survey lies in the range (1.6 - 1.8) x 10^{-5} h_{75}^{3} Mpc^{-3}, ~1.5 times higher than the local distribution of comparably rich Abell RC >= 0 clusters. The Lambda_CL distribution is consistent with a power-law. The discrepancy between the space density of Abell clusters and the clusters in this survey declines quickly as Lambda_CL increases, suggesting that the difference at lower richness is due to significant incompleteness in the Abell catalog. A percolation analysis reveals that 10 - 20% of the spectroscopically confirmed distant clusters are linked into superclusters at overdensities between 10 < {delta
ho over
ho} < 50, similar to what is seen in the local cluster distribution. This suggests that there has been little evolution of the cluster-cluster correlation length for z <= 0.5. | | Source: | arXiv, astro-ph/0205513 | | Services: | Forum | Review | PDF | Favorites | |
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