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Date and Time of the Query: 2019-04-20 T18:04:04 PDT
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For refcode 2004MNRAS.354.1255S:
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NED Abstract

Copyright by Royal Astronomical Society. 2004MNRAS.354.1255S Determining cosmological parameters from X-ray measurements of strong lensing clusters Sereno, M.; Longo, G. Abstract. 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_>=-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. Keywords: gravitational lensing, galaxies: clusters: general, cosmological parameters, cosmology: theory, dark matter, X-rays: galaxies: clusters
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