On 9/16/14, 12:40 AM, Steve Willner wrote:
In article ,
Eric Flesch writes:
is there broadly a redshift dependency in
lens power, that is, lens mass? Are high-z lenses seen to be more
powerful than low-z lenses, or is that susceptible to a Malmquist
bias?

This seems difficult to measure, and I doubt the answer is known.
You'd need a low-z and high-z lensing sample with known masses.

In as much as lensable mass varies with universe density ~H^2/G (1+z)^3
then "high-z lenses will to be more powerful than low-z lenses"