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Constraints on Cosmological Parameters from the Analysis of the Cosmic Lens All Sky Survey Radio-Selected Gravitational Lens Statistics

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arxiv astro-ph/0209602 v1 pith:2MF5FTAD submitted 2002-09-28 astro-ph

K.-H. Chae , A.D. Biggs , R.D. Blandford , I.W.A. Browne , A.G. de Bruyn , C.D. Fassnacht , P. Helbig , N.J. Jackson
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L.J. King L.V.E. Koopmans S. Mao D.R. Marlow J.P. McKean S.T. Myers M. Norbury T.J. Pearson P.M. Phillips A.C.S. Readhead D. Rusin C.M. Sykes P.N. Wilkinson E. Xanthopoulos T. York (The CLASS collaboration)
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abstract

We derive constraints on cosmological parameters and the properties of the lensing galaxies from gravitational lens statistics based on the final Cosmic Lens All Sky Survey (CLASS) data. For a flat universe with a classical cosmological constant, we find that the present matter fraction of the critical density is $\Omega_{\rm m}=0.31^{+0.27}_{-0.14}$ (68%) $^{+0.12}_{-0.10}$ (systematic). For a flat universe with a constant equation of state for dark energy $w = p_x({pressure})/\rho_x({energy density})$, we find $w < -0.55^{+0.18}_{-0.11}$ (68%).

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