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cegec
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Homework Statement
I am working on a project for my cosmology course. I need to determine the Hubble constant from time delay in a gravitational lens. We are using QSO 0957+561 for our data. My question is how do I determine the relevant distances Dl, Ds? I have Dls already. The equation for that is as follows:
Homework Equations
Dls=[tex]\frac{2c}{H_{o}}[/tex][tex]\frac{\sqrt{1+z_{l}}(1+z_{s}^{2})-\sqrt{1+z_{s}}(1+z_{l}^{2})}{(1+z_{s})^{2}(1+z_{l})}[/tex]
The Attempt at a Solution
Is it also possible to calculate the distances from the time delay? Or should I work strictly with the redshifts of the lens and the source?
thanks