The Durham/UKST Galaxy Redshift Survey - III. Large-scale structure via the two-point correlation function
Abstract
We have investigated the statistical clustering properties of galaxies by calculating the two-point galaxy correlation function from the optically selected Durham/UKST Galaxy Redshift Survey. This survey is magnitude-limited to b_J~17, contains ~2500 galaxies sampled at a rate of one-in-three and surveys a ~4x10^6 (h^-1 Mpc)^3 volume of space. We have empirically determined the optimal method of estimating the two-point correlation function from just such a magnitude-limited survey. Applying our methods to this survey, we find that our redshift-space results agree well with those from previous optical surveys. In particular, we confirm the previously claimed detections of large-scale power out to ~40 h^-1 Mpc scales. We compare with two common models of cosmological structure formation and find that our two-point correlation function has power significantly in excess of the standard cold dark matter model in the 10-30 h^-1 Mpc region. We therefore support the observational results of the APM galaxy survey. Given that only the redshift-space clustering can be measured directly, we use standard modelling methods and indirectly estimate the real-space two-point correlation function from the projected two-point correlation function. We then invert this projected correlation function to obtain an estimate of the spatial two-point correlation function in real space. This correlation function in real space has a lower amplitude than that in redshift space, but a steeper slope.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 1998
- DOI:
- 10.1046/j.1365-8711.1998.01329.x
- arXiv:
- arXiv:astro-ph/9702227
- Bibcode:
- 1998MNRAS.296..173R
- Keywords:
-
- SURVEYS;
- GALAXIES: CLUSTERS: GENERAL;
- GALAXIES: GENERAL;
- COSMOLOGY: OBSERVATIONS;
- LARGE-SCALE STRUCTURE OF UNIVERSE;
- Astrophysics
- E-Print:
- 12 pages, 1 Latex file for text, 1 epsf file, 9 Postscript files for Figures. Needs mn.sty , Submitted to MNRAS