Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-25
Int.J.Mod.Phys.D13:1005-1018,2004
Astronomy and Astrophysics
Astrophysics
20 pages latex; Modified " Results and Discussion " section, new references added
Scientific paper
10.1142/S0218271804004979
The present day observations favour a universe which is flat, accelerated and composed of $\sim 1/3$ matter (baryonic + dark) and $\sim 2/3$ of a negative pressure component, usually referred to as dark energy or quintessence. The Cosmic Lens All Sky Survey (CLASS), the largest radio-selected galactic mass scale gravitational lens search project to date, has resulted in the largest sample suitable for statistical analyses. In the work presented here, we exploit observed image separations of the multiply imaged lensed radio sources in the sample. We use two different tests: (1) image separation distribution function $n(\Delta\theta)$ of the lensed radio sources and (2) ${\dtheta}_{\mathrm{pred}}$ vs ${\dtheta}_{\mathrm{obs}}$ as observational tools to constrain the cosmological parameters $w$ and $\Om$. The results are in concordance with the bounds imposed by other cosmological tests.
Dev Abha
Jain Deepak
Mahajan Shobhit
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