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Phys. Rev. Lett. 89, 151301 (2002) [4 pages]

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

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K.-H. Chae1, A. D. Biggs1, R. D. Blandford2, I. W. A. Browne1, A. G. de Bruyn3, C. D. Fassnacht4, P. Helbig1, N. J. Jackson1, L. J. King5, L. V. E. Koopmans2, S. Mao1, D. R. Marlow6, J. P. McKean1, S. T. Myers7, M. Norbury1, T. J. Pearson2, P. M. Phillips1, A. C. S. Readhead2, D. Rusin8, C. M. Sykes1, P. N. Wilkinson1, E. Xanthopoulos1, and T. York1
1University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, United Kingdom
2California Institute of Technology, Pasadena, California 91125
3NFRA, Postbus 2, 7990 A A Dwingeloo, The Netherlands
4Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218
5University of Bonn, Auf dem Hügel, 69, D-53121 Bonn, Germany
6Department of Physics and Astronomy, University of Pennsylvania, 209 S. 33rd Street Philadelphia, Pennsylvania 19104
7National Radio Astronomy Observatory, P.O. Box 0, Soccoro, New Mexico 87801
8Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-51, Cambridge, Massachusetts 02138

Received 6 June 2002; revised 6 August 2002; published 20 September 2002

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 data. For a flat universe with a classical cosmological constant, we find that the present matter fraction of the critical density is Ωm=0.31-0.14+0.27   (68%)-0.10+0.12 (syst). For a flat universe with a constant equation of state for dark energy w=px(pressure)/ρx(energy density), we find w<-0.55-0.11+0.18 (68%).

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.151301
DOI:
10.1103/PhysRevLett.89.151301
PACS:
98.80.Es, 98.62.Py, 98.62.Sb, 98.80.Cq
 
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