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- W2093584178 abstract "We have identified seven (field) elliptical galaxies acting as strong gravitational lenses and have used them to measure cosmological parameters. To find the most likely value for Ωm (=Ωmatter) and Λ, we have used the combined probabilities of these lens systems having the observed critical radii (or image deflection) for the measured or estimated values of lens redshifts, source redshifts, and lens magnitudes. Our measurement gives Λ=0.64+ 0.15−0.26 if Ωm + Λ = 1, and the Ωm = 1 model is excluded at the 97% confidence level. We also find, at the 68% (Ω = 0)-82% (Ω = 0.3) confidence level, that an open universe is less likely than a flat universe with nonzero Λ. Except for the possibility of strong perturbations due to cluster potentials and the systematic overestimate of the lens magnitudes, other possible systematic errors do not seem to influence our results strongly: correction of possible systematic errors seems to increase the significance of the result in favor of a nonzero Λ model." @default.
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- W2093584178 date "1997-02-01" @default.
- W2093584178 modified "2023-10-02" @default.
- W2093584178 title "A Measurement of the Cosmological Constant Using Elliptical Galaxies as Strong Gravitational Lenses" @default.
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- W2093584178 doi "https://doi.org/10.1086/303583" @default.
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