Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-02
Astronomy and Astrophysics
Astrophysics
2 pages, 1 figure, proceedings of Marseille conference 25-29 June 2001, "Where's the Matter? Tracing Dark and Bright Matter wi
Scientific paper
Where's the matter? The answer seems to be: ``distributed according to a power spectrum with at least one feature (local maximum) near 120-130h^-1Mpc''. Analyses of the Iovino, Clowes & Shaver quasar candidate catalogue at z~2 and the 2dF Quasar Survey 10K Release (2QZ-10K) support this claim, which has previously been made both for low redshift survey analyses and for high z~3) redshift surveys will be presented. This feature (i) offers a comoving standard ruler which can lift the matter density-cosmological constant (Omega_m-Omega_Lambda) degeneracy and (ii) might be due either to baryonic acoustic oscillations or to Planck epoch physics which survives through inflation. (i) The 95% confidence constraint from the 2QZ-10K is Omega_m= 0.25\pm0.15, Omega_Lambda=0.60{\pm0.35}. This constraint is independent of cosmic microwave background constraints and type Ia supernovae constraints. The only assumptions required are (a) that the Universe satisfies a perturbed Friedmann-Lema\^{\i}tre-Robertson-Walker model with a possibly non-zero cosmological constant, (b) that the density perturbations in this model on large scales (>> 10h^-1Mpc) remain small (``linear'') and approximately spatially fixed in comoving coordinates, (c) that the statistics (power spectrum or correlation function) of the perturbations are redshift independent, and (d) that quasar redshifts are cosmological.
Bajtlik Stanislaw
Mamon Gary A.
Roukema Boudewijn F.
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