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Title:
Evolution of faint galaxy clustering. The 2-point angular correlation function of 20,000 galaxies to V<23.5 and I<22.5
Authors:
Cabanac, R. A.; de Lapparent, V.; Hickson, P.
Affiliation:
AA(Institut d'Astrophysique de Paris, CNRS, 98 bis bvd Arago, 75014 Paris, France; Department of Physics and Astronomy, UBC, 2219 Main Mall, Vancouver, BC V6T1Z4, Canada), AB(Institut d'Astrophysique de Paris, CNRS, 98 bis bvd Arago, 75014 Paris, France), AC(Department of Physics and Astronomy, UBC, 2219 Main Mall, Vancouver, BC V6T1Z4, Canada)
Publication:
Astronomy and Astrophysics, v.364, p.349-368 (2000) (A&A Homepage)
Publication Date:
12/2000
Origin:
A&A
Astronomy Keywords:
Cosmology: Large-Scale Structure of Universe, Galaxies: Evolution
Bibliographic Code:
2000A&A...364..349C

Abstract

The UH8K wide field camera of the CFHT was used to image 0.68 deg2 of sky. From these images, ~ 20,000 galaxies were detected to completeness magnitudes V<23.5 and I<22.5. The angular correlation function of these galaxies is well represented by the parameterization omega (theta ) = A_W theta -delta . The slope delta =~ -0.8 shows no significant variation over the range of magnitude. The amplitude A_W decreases with increasing magnitude in a way that is most compatible with a Lambda CDM model (Omega_0 = 0.2, Lambda =0.8) with a hierarchical clustering evolution parameter epsilon >0. We infer a best-fit spatial correlation length of r00 =~ 5.85+/-0.5 h-1 Mpc at z=0. The peak redshift of the survey (I<=22.5) is estimated to be zpeak ~ 0.58, using the blue-evolving luminosity function from the CFRS and the flat Lambda cosmology, and r_0(zpeak) =~ 3.5+/-0.5 h-1 Mpc. We also detect a significant difference in clustering amplitude for the red and blue galaxies, quantitatively measured by correlation lengths of r00=5.3+/-0.5 h-1 Mpc and r00=1.9+/-0.9 h-1 Mpc respectively, at z=0.

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