297 citations · 615 across the 11 of their papers we have counts for
11 papers
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…
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…
A Keck Survey of Gravitational Lens Systems: I. Spectroscopy of SBS 0909+532, HST 1411+5211, and CLASS B2319+051
L. M. Lubin, C. D. Fassnacht, A. C. S. Readhead +2
We present new results from a continuing Keck program to study gravitational lens systems. We have obtained redshifts for three lens systems, SBS 0909+532, HST 1411+5211, and CLASS…
The External Shear Acting on Gravitational Lens B 1422+231
Tomislav Kundic, David W. Hogg, Roger D. Blandford +3
In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens.…
Keck Spectroscopy of the Gravitational Lens System PG 1115+080: Redshifts of the Lensing Galaxies
Tomislav Kundic, Judith G. Cohen, Roger D. Blandford +1
The quadruple system PG 1115+080 is the second gravitational lens with a reported measurement of the Hubble constant. In addition to the primary lens, three nearby galaxies are bel…
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…