3 papers
astro-ph2000
Microlensing results from APO monitoring of the double quasar Q0957+561A,B between 1995 and 1998
Joachim Wambsganss, Robert W. Schmidt, Wesley N. Colley +2
If the halo of the lensing galaxy 0957+561 is made of massive compact objects (MACHOs), they must affect the lightcurves of the quasar images Q0957+561 A and B differently. We sear…
astro-ph2000
Modeling Galaxy Lenses
Roger Blandford, Gabriela Surpi, Tomislav Kundic
In order to use a gravitational lens to measure the Hubble constant accurately, it is necessary to derive a reliable model of the lens surface potential. If the analysis is restric…
astro-ph1996
Gravitational Lensing and the Extragalactic Distance Scale
Roger D. Blandford, Tomislav Kundic
The potential of gravitational lenses for providing direct, physical measurements of the Hubble constant, free from systematic errors associated with the traditional distance ladde…