Constraining the cosmological parameters from gravitational lenses with several families of images

Details Constraining the cosmological parameters from gravitational lenses with several families of images Constraining the cosmological parameters from gravitational lenses with several families of images

2000-10-17

arxiv.org/abs/astro-ph/0010324v1

Astronomy and Astrophysics

Astrophysics

6 pages, includes 7 postscript figures, to appear in the proceedings of the IAP2000 meeting "Constructing the Universe with Cl

Scientific paper

The knowledge of the redshift of multiple images in cluster-lenses allows to determine precisely the total projected mass within the Einstein radius. The observation of various multiple images in a same cluster is opening new possibilities to constrain the curvature of the universe. Indeed, although the influence of $\Omega_m$ and $\Omega_\lambda$ on the images formation is of the second order, observations of many multiple images at different redshifts formed by a regular cluster-lens should allow to constrain very accurately the mass distribution of the cluster and to start to be sensitive to the cosmological parameters entering the diameter angular distances. We present, analytical expressions and numerical simulations that allow us to compute the expected error bars on the cosmological parameters provided an HST/WFPC2 resolution image and spectroscopic redshifts for the multiple images. Numerical tests on simulated data confirm the rather small uncertainties we could obtain this way for the two popular cosmological world models: $\Omega_m=0.3{\pm 0.24}$, $\Omega_\lambda=0.7{\pm 0.5}$ or $\Omega_m=1.{\pm 0.33}$, $\Omega_\lambda=0.{\pm 1.2}$. Our method can be applied from now on, on real clusters.

Affiliated with

Also associated with

No associations

Rating

Constraining the cosmological parameters from gravitational lenses with several families of images 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 Constraining the cosmological parameters from gravitational lenses with several families of images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraining the cosmological parameters from gravitational lenses with several families of images will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-398296