2004/01/06 by Kazuhiro Yamamoto
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/382496
published as Astrophys.J. 605 (2004) 620-624 · 15 pages, 5 figures, accepted for publication in the Astrophysical Journal
arxiv created 2004/01/06 · openalex publication_date 2004/04/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
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 Λ 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.