Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-04
Astronomy and Astrophysics
Astrophysics
10 pages, no figures, uses newpasp.sty, invited review to be published in IAU Symposium No. 201: New Cosmological and the Valu
Scientific paper
The 0th, 1st and 2nd derivatives of a ``Fermat potential'' give the three D's of gravitational lensing: delay, deflection and distortion. Observations of these delays, deflections and distortions for doubly and quadruply imaged quasars give estimates of Hubble's constant, H_0. The single largest contribution to the uncertainty in H_0 arises from the difficulty in constraining the degree of central concentration of the lensing potential. Fortunately, astronomers have spent a good deal of effort over the past quarter century addressing just this question. If galaxies at z=0.5 are like nearby galaxies, the associated systematic uncertainty in H_0 is less than 10%. The expected lens-to-lens scatter is 20%. Results from three particularly well constrained systems are reported.
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