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

M. Sereno; G. Longo

doi:10.1111/j.1365-2966.2004.08284.x

paper

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

arXiv:astro-ph/0409119 · doi:10.1111/j.1365-2966.2004.08284.x

Abstract

We discuss a new method which 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 to probe the amount and equation of state of the dark energy in the universe. The analysis of a preliminary sample of 6 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 $Ω_{Λ} = 1.1$ with a statistical error of $\pm 0.2$ . Including the constraint of a flat universe and an equation of state for the dark energy $w_{X} \geq - 1$ , we obtain $Ω_{M} = 0.10 \pm 0.10$ and $w_{X} = - 0.84 \pm 0.14$ . Relaxing the prior on $w_{X}$ , we find that the null energy condition is satisfied at the 3- $σ$ confidence level.

arXiv comment9 pages; 5 figures; accepted for publication in MNRAS

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

Abstract

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