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The Hubble Constant from Gravitational Lens Time Delays
C. S. Kochanek, P. L. Schechter
There are now 10 firm time delay measurements in gravitational lenses. The physics of time delays is well understood, and the only important variable for interpreting the time dela…
Gravitational Lenses, the Distance Ladder and the Hubble Constant: A New Dark Matter Problem
C. S. Kochanek
In cold dark matter models, a galaxy's dark matter halo is more spatially extended than its stars. However, even though the five well-constrained gravitational lenses with time del…
The Infrared Einstein Ring in the Gravitational Lens MG1131+0456 and the Death of the Dusty Lens Hypothesis
C. S. Kochanek, E. E. Falco, C. D. Impey +5
We have obtained and modeled new NICMOS images of the lens system MG1131+0456, which show that its lens galaxy is an H=18.6 mag, transparent, early-type galaxy at a redshift of abo…
Why Quasar Pairs Are Binary Quasars And Not Gravitational Lenses
C. S. Kochanek, E. E. Falco, J. A. Munoz
We use simple comparisons of the optical and radio properties of the wide separation (3'' to 10'') quasar pairs to demonstrate that they are binary quasars rather than gravitationa…
A Technical Memorandum On Core Radii In Lens Statistics
C. S. Kochanek
Quantitative estimates of lensing probabilities must be self-consistent. In particular, for asymptotically isothermal models: (1) using the correction for the velocit…