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The KX method for producing K-band flux-limited samples of quasars
S. J. Warren, P. C. Hewett, C. B. Foltz
The longstanding question of the extent to which the quasar population is affected by dust extinction, within host galaxies or galaxies along the line of sight, remains open. More…
Limits on the star formation rates of z>2 damped Ly-alpha systems from H-alpha spectroscopy
Andrew J. Bunker, Stephen J. Warren, D. L. Clements +2
We present the results of a long-slit K-band spectroscopic search for H-alpha emission from eight damped Ly-alpha absorbers (DLAs) at z>2 with the goal of measuring the star-format…
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…
A VLT colour image of the optical Einstein ring 0047-2808
S. J. Warren, G. F. Lewis, P. C. Hewett +3
The optical Einstein ring 0047-2808 was imaged by the VLT UT1 during the science verification programme. The ring is the image of a high-redshift z=3.595 star-forming galaxy, with…