Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-06
in 18th IAP Astrophysics Colloquium, On the nature of dark energy (2002), ed. P. Brax, J. Martin & J.-P. Uzan (Paris: Frontier
Astronomy and Astrophysics
Astrophysics
4 pages LaTeX2e, 2 figures and style file included. To appear in XVIIIth IAP Colloquium, On the Nature of Dark Energy: observa
Scientific paper
Structures on very large scales (> 100 Mpc) have negligible peculiar motions, and are thus roughly fixed in comoving space. We looked for significant peaks at very large separation in the two-point correlation function -- corrected for redshift selection effects -- of a well convered subsample of 2378 quasars of the recently released 10k sample of the 2dF quasar survey. Dividing our sample in three redshift intervals, we find a peak at 244/h Mpc, which is perfectly comoving for a restricted set of cosmological parameters, namely Omega_m = 0.25+/-0.15 and Omega_Lambda=0.65+/-0.35 (both at 95% confidence). Assuming a flat Universe, we constrain the quintessence parameter w_Q < -0.35 (95% confidence). We discuss the compatibility of our analysis with possible peaks in the power spectrum.
Mamon Gary A.
Roukema Boud F.
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