We present a catalogue of galaxy groups and clusters selected using a friends-of-friends algorithm with a dynamic linking length from the 2dF-SDSS and QSO ( 2SLAQ ) luminous red galaxy survey .
The linking parameters for the code are chosen through an analysis of simulated 2SLAQ haloes .
The resulting catalogue includes 313 clusters containing 1,152 galaxies .
The galaxy groups and clusters have an average velocity dispersion of \overline { \sigma } _ { v } = 467.97 kms ^ { -1 } and an average size of \overline { R } _ { clt } = 0.78 Mpc h ^ { -1 } .
Galaxies from regions of one square degree and centred on the galaxy clusters were downloaded from the Sloan Digital Sky Survey Data Release 6 ( SDSS DR6 ) .
Investigating the photometric redshifts and cluster red-sequence of these galaxies shows that the galaxy clusters detected with the FoF algorithm are reliable out to z \sim 0.6 .
We estimate masses for the clusters using their velocity dispersions .
These mass estimates are shown to be consistent with 2SLAQ mock halo masses .
Further analysis of the simulation haloes shows that clipping out low richness groups with large radii improves the purity of catalogue from 52 \% to 88 \% , while retaining a completeness of 94 \% .
Finally , we test the two-point correlation function of our cluster catalogue .
We find a best-fitting power law model , \xi ( r ) = ( r / r _ { 0 } ) ^ { \gamma } , with parameters r _ { 0 } = 24 \pm 4 Mpc h ^ { -1 } and \gamma = -2.1 \pm 0.2 , which are in agreement with other low redshift cluster samples and consistent with a \Lambda CDM universe .