| Sumario: | We present a clustering analysis of QSOs over the redshift range z=0.3-2.9. We use a sample of 10558 QSOs taken from the preliminary catalogue of the 2dF QSO Redshift Survey (2QZ). The two-point redshift-space correlation function of QSOs is shown to follow a power law on scales s~1-35h-1Mpc. Fitting a power law to QSO clustering averaged over the redshift interval 0.3<z<2.9 (eds).="" (rejected="" 2qz.="" a="" although="" an="" and="" apply,="" are="" as="" at="" best="" clustering="" comoving="" comparable="" coordinates="" cosmology="" does="" eds="" einstein-de="" evolution="" extends="" find="" fit="" follow="" for="" function="" galaxies.="" gamma="1.56+0.10-0.09." gravitational="" growth="" high="" in="" increase="" instability="" is="" lambda_0="0.7" large="" law="" linear="" local="" marginal="" mean="" measure="" measured="" no="" not="" of="" omega_0="0.3" on="" optically="" over="" power="" predictions="" qso="" qsos="" range="" redshift="" redshift.="" s_0="5.69+0.42-0.50h-1Mpc" scales="" selected="" should="" shows="" sitter="" s~60h-1mpc="" the="" theory="" there="" these="" to="" values,="" via="" we="" where="" with="" z="1.49,">99 per cent confidence level). A redshift dependent bias is required to reconcile QSO clustering observations with theory. A simple biasing model, in which QSOs have cosmologically long lifetimes (or alternatively form in peaks above a constant threshold in the density field) is acceptable in an EdS cosmology, but is only marginally acceptable if Omega_0=0.3 and lambda_0=0.7. Biasing models which assume QSOs form over a range in redshift, based on the Press-Schechter formalism are approximately consistent with QSO clustering evolution (abridged).</z<2.9>
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