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astro-ph2001★ 17 cited
A Survey for Large Separation Lensed FIRST Quasars
E. O. Ofek, D. Maoz, F. Prada +2
Little is known about the statistics of gravitationally lensed quasars at large (7''-30'') image separations, which probe masses on the scale of galaxy clusters. We have carried ou…
astro-ph2001★ 3 cited
Lensing by Lyman Limit Systems: Determining the Mass to Gas Ratio
Ariyeh Maller, Tsafrir Kolatt, Matthias Bartelmann +1
We present a new method to determine the total mass-to-neutral gas ratio in Lyman-limits systems. The method exploits the relation between the neutral hydrogen column density and t…