95 citations · 594 across the 16 of their papers we have counts for
16 papers
Fast Computational Convolution Methods For Extended Source Effects In Microlensing Lightcurves
Hans J. Witt, F. Atrio-Barandela
Extended source effects can be seen in gravitational lensing events when sources cross critical lines. Those events probe the stellar intensity profile and could be used to measure…
Combining time delays and image positions for quadruple lenses: a moment approach
Hans Witt, Shude Mao
Time delays in gravitational lenses can be used to determine the Hubble constant and the lens potential. In future surveys, many gravitational lenses can be discovered, and their t…
Three-dimensional Microlensing
Shude Mao, Hans J. Witt, Jin H. An
We study three-dimensional microlensing where two lenses are located at different distances along the line of sight. We formulate the lens equation in complex notations and recover…
Lensing by a singular isothermal sphere and a black hole
Shude Mao, Hans Witt
Most galaxies host central supermassive black holes. As two galaxies merge, the black holes also merge. The final single black hole may suffer a kick due to asymmetric gravitationa…
Fitting Gravitational Lenses: Truth or Delusion
N. W. Evans, H. J. Witt
The observables in a strong gravitational lens are usually just the image positions and sometimes the flux ratios. We develop a new and simple algorithm which allows a set of model…
Are there sextuplet and octuplet image systems?
N. W. Evans, H. J. Witt
We study gravitational lensing by the family of scale-free galaxies with flat rotation curves. The models are defined by a shape function, which prescribes the radius of the isopho…