The 2dF QSO Redshift Survey - II. Structure and evolution at high redshift

Details The 2dF QSO Redshift Survey - II. Structure and evolution at high redshift The 2dF QSO Redshift Survey - II. Structure and evolution at high redshift

2000-12-18

arxiv.org/abs/astro-ph/0012375v2

Mon.Not.Roy.Astron.Soc. 325 (2001) 483

Astronomy and Astrophysics

Astrophysics

16 pages, 13 figures, MNRAS in press. Typo in abstract fixed (power law index). Also available at http://www.aao.gov.au/loca

Scientific paper

10.1046/j.1365-8711.2001.04389.x

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 0.399 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).

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