Abstract:
The time delay between the multiple images in gravitational lens
systems is affected by large scale mass distribution in the lens, even though it
might not have observable effects on the macro images. Inhomogeneity at very
small scale will not directly affect the time delay but will influence the models of
mass distribution in the lens galaxy. How this degeneracy can be eliminated is
described. A method to determine time delay based on smoothed cubic splines
is explained. The value of the Hubble Constant, inferred from the time delay
in 5 well-constrained lens systems is 56 ± 8 kIn S-1 Mpc-1•
