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GEMS Survey Data and Catalog
J. A. R. Caldwell, D. H. McIntosh, H-W. Rix +14
We describe the data reduction and object cataloging for the GEMS survey, a large-area (800 arcmin^2) two-band (F606W and F850LP) imaging survey with the Advanced Camera for Survey…
Discovery of a bright quasar without a massive host galaxy
Pierre Magain, Geraldine Letawe, Frederic Courbin +4
Quasars are thought to be powered by the infall of matter onto a supermassive black hole at the centre of massive galaxies. As the optical luminosity of quasars exceeds that of the…
GRB 021004 modelled by multiple energy injections
A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel +43
GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new opt…
Dry Mergers in GEMS: The Dynamical Evolution of Massive Early-Type Galaxies
Eric F. Bell, Thorsten Naab, Daniel H. McIntosh +16
We have used the 28'x 28' HST image mosaic from the GEMS (Galaxy Evolution from Morphology and SEDs) survey in conjunction with the COMBO-17 photometric redshift survey to constrai…
Evidence for a magnitude-dependent bias in the Hamburg/ESO Survey for Damped Lyman-alpha Systems
A. Smette, L. Wisotzki, C. Ledoux +3
We present preliminary results from the Hamburg/ESO survey for Damped Ly-alpha (hereafter, DLA) Systems. This survey is characterized by (i) the good knowledge of the biases affect…
High-redshift quasar host galaxies with adaptive optics
B. Kuhlbrodt, E. Orndahl, L. Wisotzki +1
We present K band adaptive optics observations of three high-redshift (z ~ 2.2) high-luminosity quasars, all of which were studied for the first time. We also bserved several point…
Metal Abundances in a Damped Lyman-alpha System Along Two Lines of Sight at z=0.93
S. Lopez, D. Reimers, M. D. Gregg +3
We study metal abundances in the z=0.9313 damped Lya system observed in the two lines-of-sight, A and B, toward the gravitationally-lensed double QSO HE0512-3329. Spatially resolve…
GEMS: The Size Evolution of Disk Galaxies
Marco Barden, Hans-Walter Rix, Rachel S. Somerville +14
We combine HST imaging from the GEMS survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z<1.1. The sample is comprised of all…