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A new population of extended, luminous star clusters in the halo of M31
A. P. Huxor, N. R. Tanvir, M. J. Irwin +5
We present three new clusters discovered in the halo of M31 which, although having globular-like colours and luminosities,have an unusually large half-light radii, ~30 pc. They lie…
Science Programs for a 2 m-class Telescope at Dome C, Antarctica: PILOT, the Pathfinder for an International Large Optical Telescope
M. G. Burton, J. Lawrence, M. C. B. Ashley +24
The cold, dry and stable air above the summits of the Antarctic plateau provides the best ground-based observing conditions from optical to sub-mm wavelengths to be found on the Ea…
Probing Sub-parsec Structure in the Lyman Alpha Forest with Gravitational Microlensing
Brendon J. Brewer, Geraint F. Lewis
We present the results of microlens ray-tracing simulations showing the effect of absorbing material between a source quasar and a lensing galaxy in a gravitational lens system. We…
The lens and source of the optical Einstein ring gravitational lens ER 0047-2808
Randall B. Wayth, Stephen J. Warren, Geraint F. Lewis +1
(Abridged) We perform a detailed analysis of the optical gravitational lens ER 0047-2808 imaged with WFPC2 on the Hubble Space Telescope. Using software specifically designed for t…
The Canis Major Dwarf Galaxy
Geraint F. Lewis, Rodrigo A. Ibata, Michael J. Irwin +3
Recent observational evidence suggests that the Sagittarius dwarf galaxy represents the only major ongoing accretion event in the Galactic halo, accounting for the majority of stel…
Gravitational Microlensing of Fractal Sources
Geraint F. Lewis
Gravitational microlensing has proven to be a powerful tool in the study of quasars, providing some of the strongest limits on the scales of structure in the central engine. Typica…