Power spectrum analysis of the two-degree field QSO sample revisited

We revisit the power spectrum analysis of the complete sample of the Two-Degree field (2dF) QSO redshift (2QZ) survey, as a complementary test of the work by Outram et al. A power spectrum consistent with that of the 2QZ group is obtained. Differently from their approach, fitting of the power spectrum is investigated by incorporating the nonlinear effects, the geometric distortion, and the light-cone effect. It is shown that the QSO power spectrum is consistent with a A cold dark matter model with the matter density parameter Ω_m = 0.2-0.5. Our constraint on the density parameter is rather weaker than that of the 2QZ group. We also show that the constraint slightly depends on equation-of-state parameter w of the dark energy. The constraint on w from the QSO power spectrum is demonstrated, although it is not very tight.