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Weak lensing measurements of dark matter halos of galaxies from COMBO-17
M. Kleinheinrich, P. Schneider, H. -W. Rix +8
We present a measurement of mass estimates for dark matter halos around galaxies from the COMBO-17 survey using weak gravitational lensing. COMBO-17 is particularly useful for this…
Cosmochemistry, Cosmology and Fundamental Constants: High-Resolution Spectroscopy of Damped Lyman-Alpha Systems
R. Quast, D. Reimers, A. Smette +4
Spectroscopy of QSO absorption lines provides essential observational input for the study of nucleosynthesis and chemical evolution of galaxies at high redshift. But new observatio…
The Evolution of Early-type Red Galaxies with the GEMS Survey: Luminosity-size and Stellar Mass-size Relations Since z=1
Daniel H. McIntosh, Eric F. Bell, Hans-Walter Rix +14
We combine HST/ACS imaging from the GEMS survey with redshifts and rest-frame quantities from COMBO-17 to study the evolution of morphologically early-type galaxies with red colors…
The stellar content of the Hamburg/ESO survey. III. Field horizontal-branch stars in the Galaxy
N. Christlieb, T. C. Beers, C. Thom +5
We present a sample of 8321 candidate Field Horizontal-Branch (FHB) stars selected by automatic spectral classification in the digital data base of the Hamburg/ESO objective-prism…
Cosmological weak lensing with the HST GEMS survey
Catherine Heymans, Michael L. Brown, Marco Barden +16
We present our cosmic shear analysis of GEMS, one of the largest wide-field surveys ever undertaken by the Hubble Space Telescope. Imaged with the Advanced Camera for Surveys (ACS)…
Evolution and Impact of Bars over the Last Eight Billion Years: Early Results from GEMS
S. Jogee, F. D. Barazza, H. -W. Rix +24
Bars drive the dynamical evolution of disk galaxies by redistributing mass and angular momentum, and they are ubiquitous in present-day spirals. Early studies of the Hubble Deep Fi…
Bar Evolution Over the Last Eight Billion Years: A Constant Fraction of Strong Bars in GEMS
S. Jogee, F. D. Barazza, H. -W. Rix +25
One third of present-day spirals host optically visible strong bars that drive their dynamical evolution. However, the fundamental question of how bars evolve over cosmological tim…
GEMS: which galaxies dominate the z~0.7 ultraviolet luminosity density?
C. Wolf, E. F. Bell, D. H. McIntosh +14
We combine high-resolution images from GEMS with redshifts and spectral energy distributions from COMBO-17 to explore the morphological types of galaxies that dominate the z~0.7 UV…
On-axis spectroscopy of the z=0.144 radio-loud quasar HE 1434-1600: an elliptical host with a highly ionized ISM
G. Letawe, F. Courbin, P. Magain +4
VLT on-axis optical spectroscopy of the z=0.144 radio-loud quasar HE 1434-1600 is presented. The spatially resolved spectra of the host galaxy are deconvolved and separated from th…
Evolution of optically faint AGN from COMBO-17 and GEMS
L. Wisotzki, K. Jahnke, S. F. Sanchez +13
We have mapped the AGN luminosity function and its evolution between z=1 and z=5 down to apparent magnitudes of . Within the GEMS project we have analysed HST-ACS images of m…
The influence of redshift information on galaxy-galaxy lensing measurements
M. Kleinheinrich, H. -W. Rix, T. Erben +8
We investigate how galaxy-galaxy lensing measurements depend on the knowledge of redshifts for lens and source galaxies. Galaxy-galaxy lensing allows one to study dark matter halos…
A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17
C. Wolf, K. Meisenheimer, M. Kleinheinrich +9
We present the COMBO-17 object catalogue of the Chandra Deep Field South for public use, covering a field which is 31.5' x 30' in size. This catalogue lists astrometry, photometry…
HE 0047-1756: A new gravitationally lensed double QSO
Lutz Wisotzki, Paul L. Schechter, Hsiao-Wen Chen +4
The quasar HE 0047-1756, at z=1.67, is found to be split into two images 1.44" apart by an intervening galaxy acting as a gravitational lens. The flux ratio for the two components…
Evolution of the Dark Matter Distribution with 3-D Weak Lensing
D. J. Bacon, A. N. Taylor, M. L. Brown +7
We present a direct detection of the growth of large-scale structure, using weak gravitational lensing and photometric redshift data from the COMBO-17 survey. We use deep R-band im…
Colors of AGN host galaxies at 0.5<z<1.1 from GEMS
S. F. Sanchez, K. Jahnke, L. Wisotzki +13
We present the results from a study of the host galaxies of 15 optically selected AGNs with 0.5<z<1.1 from GEMS. GEMS is a Hubble Space Telescope imaging survey of a ~28"x28" conti…
UV light from young stars in GEMS quasar host galaxies at 1.8<z<2.75
K. Jahnke, S. F. Sanchez, L. Wisotzki +13
We have performed HST imaging of a sample of 23 high-redshift (1.8<z<2.75) AGN, drawn from the COMBO-17 survey. The sample contains moderately luminous quasars (M_B ~ -23). The dat…
Mapping the 3-D dark matter with weak lensing in COMBO-17
A. N. Taylor, D. J. Bacon, M. E. Gray +7
We present a 3-dimensional lensing analysis of the z=0.16 supercluster A901/2, resulting in a 3-D map of the dark matter distribution within a 3 X 10^{5} [Mpc]^3 volume from the CO…
GEMS: Galaxy Evolution from Morphologies and SEDs
Hans-Walter Rix, Marco Barden, Steven V. W. Beckwith +12
GEMS, Galaxy Evolution from Morphologies and SEDs, is a large-area (800 arcmin2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on HST. Centered o…
Integral Field Spectroscopy of Extended Lyman-alpha Emission from the DLA Galaxy in Q2233+131
L. Christensen, S. F. Sanchez, K. Jahnke +5
This paper presents observations of an extended Lyman-alpha emission nebula surrounding the galaxy responsible for the Damped Lyman-alpha Absorption (DLA) line in the spectrum of t…
Decomposition of AGN host galaxy images
B. Kuhlbrodt, L. Wisotzki, K. Jahnke
We describe an algorithm to decompose deep images of Active Galactic Nuclei into host galaxy and nuclear components. Currently supported are three galaxy models: A de-Vaucouleurs s…
Integral field observations of DLA galaxies
L. Christensen, S. F. Sanchez, K. Jahnke +4
We report preliminary results from a targeted investigation on quasars containing damped Lyman-alpha absorption (DLA) lines as well strong metal absorption lines, carried out with…