The Angular Clustering of Distant Galaxy Clusters

Details The Angular Clustering of Distant Galaxy Clusters The Angular Clustering of Distant Galaxy Clusters

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9608p&link_type=abstract

American Astronomical Society, AAS Meeting #211, #96.08; Bulletin of the American Astronomical Society, Vol. 39, p.901

Astronomy and Astrophysics

Astronomy

Scientific paper

We will discuss the angular clustering of galaxy clusters at z > 1 selected within 50 sq. deg from the Spitzer Wide-Infrared Extragalactic survey. We employ a simple color selection to identify high redshift galaxies with no dependence on galaxy rest-frame optical color using Spitzer IRAC 3.6 and 4.5 μm photometry. The majority (>90%) of galaxies with z > 1.3 are identified with ([3.6] - [4.5]) > -0.1 AB mag. We identify candidate galaxy clusters at z > 1 by selecting overdensities of >26-28 objects with [3.6] - [4.5] > -0.1 mag within radii of 1.4 arcminutes, which corresponds to r < 0.5 Mpc/h at z = 1.5. These candidate galaxy clusters show strong angular clustering, with an angular correlation function represented by w = (4.9 ± 0.5)(Θ/1′ )-1.1±0.1 over scales of 2-50 arcminutes. Assuming the redshift distribution of these galaxy clusters follows a fiducial model, these galaxy clusters have a spatial-clustering scale length r0 = 28.8 ± 7.0 Mpc/h, and a number density n = 1.1 ±0.3 × 10-5 h3 Mpc-3 . The correlation scale length and number density of these objects imply these objects are destined to become rich galaxy clusters at low redshift.
This work is based on data obtained with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech) under a contract with NASA. Support for this work was provided by NASA through the Spitzer Space Telescope Fellowship Program, through a contract issued by JPL, Caltech under a contract with NASA.

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