Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 354, Issue 4, Pages 1255-1262Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08284.x
Keywords
gravitational lensing; galaxies : clusters : general; cosmological parameters; cosmology : theory; dark matter; X-rays : galaxies : clusters
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We discuss a new method that is potentially capable of constraining cosmological parameters using observations of giant luminous arcs in rich X-ray clusters of galaxies. The mass profile and the mass normalization of the lenses are determined from X-ray measurements. The method also allows us to probe the amount and equation of state of the dark energy in the universe. The analysis of a preliminary sample of six luminous, relatively relaxed clusters of galaxies strongly favours an accelerating expansion of the universe. Under the assumption that the dark energy is in the form of a cosmological constant, the data provide an estimate of Omega(Lambda0) = 1.1 with a statistical error of +/-0.2. Including the constraint of a flat universe and an equation of state for the dark energy w(X) greater than or equal to -1, we obtain Omega(M0) = 0.10 +/- 0.10 and w(X) = 0.84 +/- 0.14. Relaxing the prior on w(X), we find that the null energy condition (NEC) is satisfied at the 3sigma confidence level.
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