The 2dF QSO Redshift Survey -: XIII.: A measurement of Λ from the quasi-stellar object power spectrum, PS (k||,k⊥)

被引:45
|
作者
Outram, PJ
Shanks, T
Boyle, BJ
Croom, SM
Hoyle, F
Loaring, NS
Miller, L
Smith, RJ
机构
[1] Univ Durham, Sci Labs, Dept Phys, Durham DH1 3LE, England
[2] Anglo Australian Observ, Epping, NSW 2121, Australia
[3] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA
[4] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
[5] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[6] Liverpool John Moores Univ, Birkenhead CH41 1LD, Merseyside, England
关键词
surveys; quasars : general; cosmology : observations; large-scale structure of Universe;
D O I
10.1111/j.1365-2966.2004.07348.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on measurements of the cosmological constant, Lambda, and the redshift space distortion parameter beta = Ohm(m)(0.6)/b, based on an analysis of the quasi-stellar object (QSO) power spectrum in parallel and perpendicular to the observer's line of sight, P-s(k(parallel to), k(perpendicular to)), from the final catalogue of the Two-Degree Field (2dF) QSO Redshift Survey. We derive a joint <LF>Lambda - beta constraint from the geometric and redshift-space distortions in the power spectrum. By combining this result with a second constraint based on mass clustering evolution, we break this degeneracy and obtain strong constraints on both parameters. Assuming a flat (Ohm(m) + Ohm(Lambda) = 1) cosmology and a Lambda cosmology r(z) function to convert from redshift into comoving distance, we find best-fitting values of Ohm(Lambda) = 0.71(-0.17)(+0.09) and beta(q)(z similar to 1.4) = 0.45(-0.11)(+0.09). Assuming instead an Einstein-de Sitter cosmology r(z) we find that the best-fitting model obtained, with Ohm(Lambda) = 0.64(-0.16)(+0.11) and beta(q)(z similar to 1.4) = 0.40(-0.09)(+0.09), is consistent with the Lambda r(z) results, and inconsistent with a Ohm(Lambda) = 0 flat cosmology at over 95 per cent confidence.
引用
收藏
页码:745 / 752
页数:8
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