Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-24
Astrophys.J.655:790-813,2007
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ (29 pages including 13 figures). A version with high-resolution figures is available at http
Scientific paper
10.1086/510201
We present the results of applying a percolation algorithm to the initial release of the Two Micron All-Sky Survey Extended Source Catalog, using subsequently measured redshifts for almost all of the galaxies with K < 11.25 mag. This group catalog is based on the first near-IR all-sky flux-limited survey that is complete to |b| = 5 deg. We explore the dependence of the clustering on the length and velocity scales involved. The paper describes a group catalog, complete to a limiting redshift of 10,000 km/s, created by maximizing the number of groups containing 3 or more members. A second catalog is also presented, created by requiring a minimum density contrast of 80 to identify groups. We identify known nearby clusters in the catalogs and contrast the groups identified in the two catalogs. We examine and compare the properties of the determined groups and verify that the results are consistent with the UZC-SSRS2 and northern CfA redshift survey group catalogs. The all-sky nature of the catalog will allow the development of a flow-field model based on the density field inferred from the estimated cluster masses.
Crook Aidan C.
Huchra John P.
Jarrett Tom
Macri Lucas M.
Martimbeau Nathalie
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