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Microlensing of Broad Absorption Line Quasars: Polarization Variability
Kunegunda E. Belle, Geraint F. Lewis
Roughly 10% of all quasars exhibit Broad Absorption Line (BAL) features which appear to arise in material outflowing at high velocity from the active galactic nucleus (AGN). The de…
Photometric Monitoring of the Gravitationally Lensed Ultraluminous BAL Quasar APM08279+5255
Geraint F. Lewis, Russell M. Robb, Rodrigo A. Ibata
We report on one year of photometric monitoring of the ultraluminous BAL quasar APM 08279+5255. The temporal sampling reveals that this gravitationally lensed system has brightened…
An Investigation of Gravitational Lensing in the Southern BL Lac PKS 0537-441
G. F. Lewis, R. A. Ibata
The BL-Lac family of active galaxies possess almost featureless spectra and exhibit rapid variability over their entire spectral range. A number of models have been developed to ex…
NICMOS and VLA Observations of the Gravitatonally Lensed Ultraluminous BAL Quasar APM~08279+5255: Detection of a Third Image
Rodrigo A. Ibata, Geraint F. Lewis, Michael J. Irwin +2
We present a suite of observations of the recently identified ultraluminous BAL quasar APM 08279+5255, taken both in the infra-red with the NICMOS high resolution camera on board t…
The Effects of Gas Dynamics, Cooling, Star Formation, and Numerical Resolution in Simulations of Cluster Formation
G. F. Lewis, A. Babul, N. Katz +3
We present the analysis of a suite of simulations of a Virgo mass galaxy cluster. Undertaken within the framework of standard cold dark matter cosmology, these simulations were per…
High-Redshift Gravitationally Lensed Galaxies and Tunable Filter Imaging
Paul C. Hewett, Stephen J. Warren, Jon P. Willis +2
Most surveys for multiply-imaged gravitational lenses, outside of rich galaxy clusters, are based on sifting through large samples of distant sources to identify the rare examples…