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An expression for rotational velocity of a test particle around the central mass in the invariant plane is derived. For this, a line element of Schwarzschild de-Sitter space-time is used to study the effect of cosmological constant Λ) on the motion of both massive and mass-less particles in the Universe. This expression is fitted for the mass and Λ. For this, the total mass M is divided into the mass of the black hole M B and a uniform sphere of radius r dominated by dust (ρ d ) which is supposed to vary as [ please see full text PDF for the formula ]. Using rotation curve data of 6 nearby spiral and barred spiral galaxies, we estimated the value of Λ and the mass of the galaxy. The cosmological constant (Λ) is found to be positive for all 6 galaxies. The positive Λ reveals the importance of de Sitter space, suggesting accelerating Universe. The cosmological constant (Λ) and the density (ρ o ) are found to lie in the range 1.269 x 10 -41 to 9.490 x 10 -42 km -2 , and 7.044 x 10 -9 to 3.250 x 10 -8 km -1 , respectively. The mass M B is found in the range 1.867 x 10 7 to 1.730 x 10 10 solar mass. Our result shows a good agreement with the results of supernova project which gives positive Λ value, suggesting accelerating Universe. Keywords: Galaxies formation; General astronomical databases. DOI: 10.3126/sw.v8i8.3840 Scientific World Vol.8(8) 2010 pp.15-18

Estimation of Cosmological Constant of Nearby Spiral Galaxies using Rotation Curve