839 citations · 24.6k across the 409 of their papers we have counts for
4 papers · 1 filter
Two Close-Separation Quasar-Quasar Pairs in the Large Bright Quasar Survey
Paul C. Hewett, Craig B. Foltz, Margaret E. Harding +1
We present photometric and spectroscopic observations of two close quasar-quasar pairs found in the Large Bright Quasar Survey (LBQS) (Hewett et al. 1995, AJ, 109, 1498). The two c…
Microlensing of Broad Absorption Line Quasars
Geraint F. Lewis, Kunegunda E. Belle
The physical nature of the material responsible for the high--velocity, broad-absorption line features seen in a small fraction of quasar spectra has been the subject of debate sin…
Undistorted Lensed Images in Galaxy Clusters
Liliya L. R. Williams, Geraint F. Lewis
To date, the study of high-magnification gravitational lensing effects of galaxy clusters has focused upon the grossly distorted, luminous arc-like features formed in massive, cent…
Weighing a galaxy bar in the lens Q2237+0305
Robert Schmidt, Rachel L. Webster, Geraint F. Lewis
In the gravitational lens system Q2237+0305 the cruciform quasar image geometry is twisted by ten degrees by the lens effect of a bar in the lensing galaxy. This effect can be used…