Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-06
Mon.Not.Roy.Astron.Soc. 354 (2004) 1255-1262
Astronomy and Astrophysics
Astrophysics
9 pages; 5 figures; accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2004.08284.x
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 $ \Omega_\Lambda = 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 $\Omega_M = 0.10 \pm 0.10$ 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-$\sigma$ confidence level.
Longo Giuseppe
Sereno Mauro
No associations
LandOfFree
Determining cosmological parameters from X-ray measurements of strong lensing clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Determining cosmological parameters from X-ray measurements of strong lensing clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determining cosmological parameters from X-ray measurements of strong lensing clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-374347