SIMBAD references

2004MNRAS.354.1255S - Mon. Not. R. Astron. Soc., 354, 1255-1262 (2004/November-2)

Determining cosmological parameters from X-ray measurements of strong lensing clusters.


Abstract (from CDS):

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 ΩΛ0= 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 wX≥-1, we obtain ΩM0= 0.10±0.10 and wX=-0.84±0.14. Relaxing the prior on wX, we find that the null energy condition (NEC) is satisfied at the 3σ confidence level.

Abstract Copyright: 2004 RAS

Journal keyword(s): gravitational lensing - galaxies: clusters: general - cosmological parameters - cosmology: theory - dark matter - X-rays: galaxies: clusters

CDS comments: AC 114 = ACCG 114.

Simbad objects: 11

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