6 papers · 1 filter
Strong lensing constraints on the properties of cluster galaxies
Liliya L. R. Williams, Prasenjit Saha
A recently discovered quadruply-imaged QSO, SDSS J1004+4112 (Inada et al. 2003; Oguri et al. 2004) in the core of a galaxy cluster has an unprecedented image separation of…
The phase-space density distribution of dark matter halos
Liliya L. R. Williams, Crystal Austin, Eric Barnes +2
High resolution N-body simulations have all but converged on a common empirical form for the shape of the density profiles of halos, but the full understanding of the underlying ph…
Cluster Reconstruction from Combined Strong and Weak Lensing
Prasenjit Saha, Liliya L. R. Williams, Hanadi AbdelSalam
The lensing information provided by multiple images, arclets, and statistical distortions can all be formulated as linear constraints on the arrival-time surface, and hence on the…
Pixellated Lenses and Estimates of H_0 from Time-delay Quasars
Liliya L. R. Williams, Prasenjit Saha
The largest source of uncertainty in the determination of H_0 from a multiply-imaged QSO system is the unknown mass distribution in the lensing galaxy. Parametric models severely r…
Cluster Mass Profile from Lensing
Hanadi M. AbdelSalam, Prasenjit Saha, Liliya L. R. Williams
We propose a new technique to reconstruct non-parametrically the projected mass distribution of galaxy clusters from their gravitational lens effect on background galaxies. The bea…
Measurement of the Hubble Constant Via Gravitational Lensing--- A Review of the Jodrell Bank ``Golden Lenses'' Workshop
Liliya L. R. Williams, Paul L. Schechter
Gravitational lensing is now widely and successfully used to study a range of astronomical phenomena, from individual objects, like galaxies and clusters, to the mass distribution…