The 2dF-SDSS LRG and QSO survey: QSO clustering and the L-z degeneracy

We combine the quasi-stellar object (QSO) samples from the 2dF QSO Redshift Survey (2QZ) and the 2dF-Sloan Digital Sky Survey luminous red galaxy (LRG) and QSO Survey (2dF-SDSS LRG and QSO, hereafter 2SLAQ) in order to investigate the clustering of z a?? 1.5 QSOs and measure the correlation function (I?). The clustering signal in redshift-space and projected along the sky direction is similar to that previously obtained from the 2QZ sample alone. By fitting functional forms for I?(I?, I?), the correlation function measured along and across the line of sight, we find, as expected, that I?, the dynamical infall parameter and I?0m, the cosmological density parameter, are degenerate. However, this degeneracy can be lifted by using linear theory predictions under different cosmological scenarios. Using the combination of the 2QZ and 2SLAQ QSO data, we obtain: I?QSO(z = 1.5) = 0.60+0.14-0.11, I?0m = 0.25+0.09-0.07 which imply a value for the QSO bias, b(z = 1.4) = 1.5 A? 0.2.