Galaxy Cluster Correlation Function to z~1.5 in the IRAC Shallow Cluster Survey
Abstract
We present the galaxy cluster autocorrelation function of 277 galaxy cluster candidates with 0.25<=z<=1.5 in a 7 deg2 area of the IRAC Shallow Cluster Survey. We find strong clustering throughout our galaxy cluster sample, as expected for these massive structures. Specifically, at <z>=0.5 we find a correlation length of r0=17.40+3.98-3.10 h-1 Mpc, in excellent agreement with the Las Campanas Distant Cluster Survey, the only other nonlocal measurement. At higher redshift, <z>=1, we find that strong clustering persists, with a correlation length of r0=19.14+5.65-4.56 h-1 Mpc. A comparison with high-resolution cosmological simulations indicates these are clusters with halo masses of ~1014 Msolar, a result supported by estimates of dynamical mass for a subset of the sample. In a stable clustering picture, these clusters will evolve into massive (1015 Msolar) clusters by the present day.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2007
- DOI:
- 10.1086/525558
- arXiv:
- arXiv:0711.1863
- Bibcode:
- 2007ApJ...671L..93B
- Keywords:
-
- Cosmology: Observations;
- Galaxies: Clusters: General;
- Cosmology: Large-Scale Structure of Universe;
- Astrophysics
- E-Print:
- 4 pages, 4 figures, 1 table. ApJ Letters, in press