Cosmological constraints from strong gravitational lensing in clusters of galaxies.
Science
; 329(5994): 924-7, 2010 Aug 20.
Article
em En
| MEDLINE
| ID: mdl-20724628
ABSTRACT
Current efforts in observational cosmology are focused on characterizing the mass-energy content of the universe. We present results from a geometric test based on strong lensing in galaxy clusters. Based on Hubble Space Telescope images and extensive ground-based spectroscopic follow-up of the massive galaxy cluster Abell 1689, we used a parametric model to simultaneously constrain the cluster mass distribution and dark energy equation of state. Combining our cosmological constraints with those from x-ray clusters and the Wilkinson Microwave Anisotropy Probe 5-year data gives Omega(m) = 0.25 +/- 0.05 and w(x) = -0.97 +/- 0.07, which are consistent with results from other methods. Inclusion of our method with all other available techniques brings down the current 2sigma contours on the dark energy equation-of-state parameter w(x) by approximately 30%.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Science
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Estados Unidos