Cosmological Constant and Statistical Lensing of Giant Arcs

Details Cosmological Constant and Statistical Lensing of Giant Arcs Cosmological Constant and Statistical Lensing of Giant Arcs

1995-12-04

arxiv.org/abs/astro-ph/9512014v1

Astrophys.J. 463 (1996) 404

Astronomy and Astrophysics

Astrophysics

19 pages, compressed uuencoded PS file with two figures included, ApJ in press

Scientific paper

10.1086/177256

Using a singular isothermal sphere model for the matter distribution of foreground clusters of galaxies, we study the statistics of giant arcs in flat cosmologies with and without a cosmological constant. We find that the relative number of arcs predicted within $z=1$ in a universe with $\Omega_0=0.3$ and $\lambda_0 \equiv \Lambda/(3H_0^2)=0.7$ is a factor of $\sim2$ larger than the one in the Einstein-de Sitter universe ($\Omega_0=1, \lambda_0=0$). For a luminosity-dependent evolution model of the number density of background galaxies that accounts for the over-density of faint blue galaxies at $z_s\approx0.4$, the Einstein- de Sitter cosmological model predicts that about $5\%$ of clusters of galaxies with an X-ray luminosity $L_x > 2 \times 10^{44}$ erg s$^{-1}$ should have giant arcs with length-to-width ratio larger than 10. This is a factor of $\sim4$ lower than the observed fraction in the gravitational lensing survey of distant X-ray selected EMSS clusters of galaxies, indicating that the matter distribution of clusters of galaxies deviates significantly from simple isothermal spheres or/and the presence of a significant cosmological constant. It is profitable to further study the constraint on the cosmological constant from giant arcs using more realistic cluster models.

Affiliated with

Also associated with

No associations

Rating

Cosmological Constant and Statistical Lensing of Giant Arcs 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 Cosmological Constant and Statistical Lensing of Giant Arcs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological Constant and Statistical Lensing of Giant Arcs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-81297