Evolution of Galaxy Correlations
Abstract
The CNOC field galaxy redshift survey, CNOC2, investigates the relations between the dramatic evolution of field galaxies and their clustering over the redshift range 0 to 0.7. We report preliminary results based on two of the sky patches and within the redshift range of 0.12 to 0.55. The spatial two point correlation functions have a strong colour dependence with scale, and a weaker, apparently scale free, luminosity dependence. The population most likely to be conserved with redshift is the high luminosity galaxies. In particular, we choose galaxies with M_r^{k,e} <= -20 mag as our tracer population. We find that the evolution of the clustered density in proper co-ordinates at r ls 10hmpc, rhogg propto r_0(z)^gamma(1+z)^3, where r_0(z) is the proper correlation length, is best described as a "de-clustering", propto (1+z)^{0.6 +- 0.4}. Or equivalently, there is a weak growth of clustering in co-moving co-ordinates, x_0 propto (1+z)^{-0.3 +- 0.2}.
- Publication:
-
Wide Field Surveys in Cosmology
- Pub Date:
- 1998
- Bibcode:
- 1998wfsc.conf..143C