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Substructure in Dark Halos: Orbital Eccentricities and Dynamical Friction
Frank C. van den Bosch, Geraint F. Lewis, George Lake +1
We examine the distributions of eccentricities of orbits within mass distributions like those we see for galaxies and clusters. A comprehensive understanding of these orbital prope…
B1933+503, a dusty radio quasar at z>2: implications for blank field sub-mm surveys?
Scott C. Chapman, Douglas Scott, Geraint F. Lewis +2
We present a detailed mm-wave and optical study of the gravitational lens system B1933+503, discovered by Sykes et al.(1998) in the radio. This object is probably the most complex…
Re-examination of the possible tidal stream in front of the LMC
R. Ibata, G. Lewis, J. -P. Beaulieu
It has recently been suggested that the stars in a vertical extension of the red clump feature seen in LMC color-magnitude diagrams could belong to a tidal stream of material locat…
Adaptive optics imaging and integral field spectroscopy of APM 08279+5255: Evidence for gravitational lensing
C. Ledoux, B. Theodore, P. Petitjean +5
We report observations of the z = 3.87 broad absorption line quasar APM 08279+5255 (Irwin et al. 1998) with the Adaptive Optics Bonnette (AOB) of the Canada-France-Hawaii Telescope…
Optimal proper motion measurements with the Wide Field and Planetary Camera
Rodrigo Ibata, Geraint Lewis
An optimal maximum-likelihood technique for computing point-source image centroids from many, slightly offset, CCD frames is presented. The method is especially useful for measurin…
APM 08279+5255: an ultraluminous BAL quasar at a redshift z=3.87
Michael J. Irwin, Rodrigo A. Ibata, Geraint F. Lewis +1
We report on the discovery of a highly luminous, broad absorption line quasar at a redshift of which is positionally coincident, within one arcsecond, with the IRAS FSC so…