Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing (2009)
Bridle, Sarah, Balan, Sreekumar T., Bethge, Matthias, Gentile, Marc, Harmeling, Stefan, Heymans, Catherine, ...
We present the results of the GREAT08 Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new ideas by...
Robaina, Aday R., Bell, Eric F., Skelton, Rosalind E., McIntosh, Daniel H., Somerville, Rachel S., Zheng, Xianzhong, ...
Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of starformation. Yet, the average enhancement in star formation...
Wolf, Christian, Aragón-Salamanca, Alfonso, Balogh, Michael, Barden, Marco, Bell, Eric F., Gray, Meghan E., ...
Galaxies migrate from the blue cloud to the red sequence when their star formation is quenched. Here, we report on galaxies quenched by environmental effects and not by mergers or strong AGN as often...
Jogee, Shardha, Miller, Sarah H., Penner, Kyle, Skelton, Rosalind E., Conselice, Christopher J., Somerville, Rachel S., ...
We perform a comprehensive estimate of the frequency of galaxy mergers and their impact on star formation over z~0.24--0.80 (lookback time T_b~3--7 Gyr) using 3698 (M*>=1e9 Msun) galaxies with GEMS...
Semboloni, Elisabetta, Tereno, Ismael, Van Waerbeke, Ludovic, Heymans, Catherine
The current methods available to estimate gravitational shear from astronomical images of galaxies introduce systematic errors which can affect the accuracy of weak lensing cosmological constraints....
Wolf, Christian, Aragon-Salamanca, Alfonso, Balogh, Michael, Barden, Marco, Bell, Eric F., Gray, Meghan E., ...
We investigate the properties of optically passive spirals and dusty red galaxies in the A901/2 cluster complex at redshift ~0.17 using restframe near-UV-optical SEDs, 24 micron IR data and HST...
STAGES: the Space Telescope A901/2 Galaxy Evolution Survey (2008)
Gray, M. E., Wolf, Christian, Barden, Marco, Peng, Chien Y., Haeussler, Boris, Bell, Eric F., ...
We present an overview of the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). STAGES is a multiwavelength project designed to probe physical drivers of galaxy evolution across a wide range...
Sersiclets - A Matched Filter Generalisation of Shapelets for Weak Lensing Studies (2008)
Ngan, Wai-Hin Wayne, Van Waerbeke, Ludovic, Mahdavi, Andisheh, Heymans, Catherine, Hoekstra, Henk
The precision study of dark matter using weak lensing by large scale structure is strongly constrained by the accuracy with which one can measure galaxy shapes. Several methods have been devised but...
Semboloni, Elisabetta, Heymans, Catherine, Van Waerbeke, Ludovic, Schneider, Peter
We investigate the impact of the observed correlation between a galaxies shape and its surrounding density field on the measurement of third order weak lensing shear statistics. Using numerical...
Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing (2008)
Bridle, Sarah, Shawe-Taylor, John, Amara, Adam, Applegate, Douglas, Balan, Sreekumar T., Berge, Joel, ...
The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses on a problem that is of crucial importance for future observations in cosmology. The shapes of distant galaxies can be used...
An explanation for the observed weak size evolution of disk galaxies (2008)
Somerville, Rachel S., Barden, Marco, Rix, Hans-Walter, Bell, Eric F., Beckwith, Steven V. W., Borch, Andrea, ...
Surveys of distant galaxies with the Hubble Space Telescope and from the ground have shown that there is only mild evolution in the relationship between radial size and stellar mass for galactic...
Heymans, Catherine, Gray, Meghan E., Peng, Chien Y., Van Waerbeke, Ludovic, Bell, Eric F., Wolf, Christian, ...
We present a high-resolution dark matter reconstruction of the z = 0.165 Abell 901/902 supercluster from a weak lensing analysis of the Hubble Space Telescope STAGES survey. We detect the four main...
GEMS survey data and catalog (2008)
Caldwell, John A. R., McIntosh, Daniel H., Rix, Hans-Walter, Barden, Marco, Beckwith, Steven V. W., Bell, Eric F., ...
We describe the data reduction and object cataloging for the GEMS survey, a large-area (800 arcmin2) two-band (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble...
GEMS: galaxy fitting catalogs and testing parametric galaxy fitting codes: GALFIT and GIM2D (2007)
Häußler, Boris, McIntosh, Daniel H., Barden, Marco, Bell, Eric F., Rix, Hans-Walter, Borch, Andrea, ...
In the context of measuring the structures of intermediate-redshift galaxies with HST ACS surveys, we tune, test, and compare two widely used fitting codes (GALFIT and GIM2D) for fitting...
GEMS: the destiny of blue spheroidal galaxies (2007)
Häußler, Boris, Bell, Eric F., Barden, Marco, McIntosh, Daniel H., Rix, Hans-Walter, Borch, Andrea, ...
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The Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses (2006)
Massey, Richard, Heymans, Catherine, Berge, Joel, Bernstein, Gary, Bridle, Sarah, Clowe, Douglas, ...
The Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for the next generation of wide-field surveys. We...
Cosmic variance of weak lensing surveys in the non-Gaussian regime (2006)
Semboloni, Elisabetta, Van Waerbeke, Ludovic, Heymans, Catherine, Hamana, Takashi, Colombi, Stephane, White, Martin, ...
The results from weak gravitational lensing analyses are subject to a cosmic variance error term that has previously been estimated assuming Gaussian statistics. In this letter we address the issue...
Heymans, Catherine, White, Martin, Heavens, Alan, Vale, Chris, Van Waerbeke, Ludovic
We investigate the expected correlation between the weak gravitational shear of distant galaxies and the orientation of foreground galaxies, through the use of numerical simulations. This...
Redshift and Shear Calibration: Impact on Cosmic Shear Studies and Survey Design (2006)
Van Waerbeke, Ludovic, White, Martin, Hoekstra, Henk, Heymans, Catherine
The cosmological interpretation of weak lensing by large-scale structures requires knowledge of the redshift distribution of the source galaxies. Current lensing surveys are often calibrated using...
The Shear Testing Programme - I. Weak lensing analysis of simulated ground-based observations (2006)
Heymans, Catherine, Van Waerbeke, Ludovic, Bacon, David, Berge, Joel, Bernstein, Gary, Bertin, Emmanuel, ...
The Shear Testing Programme (STEP) is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wide-field surveys. In...
Heymans, Catherine, Bell, Eric F., Rix, Hans-Walter, Barden, Marco, Borch, Andrea, Caldwell, John A. R., ...
We present constraints on the evolution of the virial to stellar mass ratio of galaxies with high stellar masses in the redshift range 0.2 < z < 0.8, by comparing weak lensing measurements of virial...
Dry mergers in GEMS: The dynamical evolution of massive early-type galaxies (2006)
Bell, Eric F., Naab, Thorsten, McIntosh, Daniel H., Somerville, Rachel S., Caldwell, John A. R., Barden, Marco, ...
We have used the 28'×28' Hubble Space Telescope image mosaic from the GEMS (Galaxy Evolution from Morphology and SEDs) survey in conjunction with the COMBO-17 photometric redshift survey to...
The Shear TEsting Programme 1: Weak lensing analysis of simulated ground-based observations (2005)
Heymans, Catherine, Van Waerbeke, Ludovic, Bacon, David, Berge, Joel, Bernstein, Gary, Bertin, Emmanuel, ...
The Shear TEsting Programme, STEP, is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wide-field surveys. In...
McIntosh, Daniel H., Bell, Eric F., Rix, Hans-Walter, Wolf, Christian, Heymans, Catherine, Peng, Chien Y., ...
We combine imaging from the Hubble Space Telescope Advanced Camera for Surveys, as part of the GEMS (Galaxy Evolution from Morphologies and SEDs) survey, with redshifts and rest-frame quantities from...
Cosmological weak lensing with the HST GEMS survey (2005)
Heymans, Catherine, Brown, Michael L., Barden, Marco, Caldwell, John A. R., Jahnke, Knud, Peng, Chien Y., ...
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), GEMS spans 795...
Allen, Paul D., Moustakas, Leonidas A., Dalton, Gavin, MacDonald, Emily, Blake, Chris, Clewley, Lee, ...
We present measurements of the clustering properties of bright (L > L*) z~ 4 Lyman break galaxies (LBGs) selected from the Oxford- Dartmouth Thirty Degree Survey (ODT). We describe techniques used to...
Weak Lensing Results from GEMS (2005)
Heymans, Catherine, Brown, Michael L., Barden, Marco, Caldwell, John A. R., Jahnke, Knud, Rix, Hans-Walter, ...
We present our cosmic shear analysis of the Galaxy Evolution from Morphology and SEDs (GEMS) survey. Imaged with the Advanced Camera for Surveys (ACS) on HST, GEMS provides high resolution imaging...
GEMS: The surface brightness and surface mass density evolution of disk galaxies (2005)
Barden, Marco, Rix, Hans-Walter, Somerville, Rachel S., Bell, Eric F., Häußler, Boris, Peng, Chien Y., ...
We combine HST imaging from the GEMS (Galaxy Evolution from Morphologies and SEDs) survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z
Allen, Paul D., Moustakas, Leonidas A., Dalton, Gavin, MacDonald, Emily, Blake, Chris, Clewley, Lee, ...
We present measurements of the clustering properties of bright (L > L*) z∼ 4 Lyman break galaxies (LBGs) selected from the Oxford–Dartmouth Thirty Degree Survey (ODT). We describe...
Allen, Paul D., Moustakas, Leonidas A., Dalton, Gavin, MacDonald, Emily, Blake, Chris, Clewley, Lee, ...
We present measurements of the clustering properties of bright (L > L*) z∼ 4 Lyman break galaxies (LBGs) selected from the Oxford–Dartmouth Thirty Degree Survey (ODT). We describe...
MacDonald, Emily C., Allen, Paul, Dalton, Gavin, Moustakas, Leonidas A., Heymans, Catherine, Edmondson, Edward, ...
The Oxford Dartmouth Thirty Degree Survey (ODTS) is a deep, wide, multi-band imaging survey designed to cover a total of 30 square degrees in BVRi'Z, with a subset of U and K band data, in four...
Weak lensing with COMBO-17: Estimation and removal of intrinsic alignments (2004)
Heymans, Catherine, Brown, Michael, Heavens, Alan, Meisenheimer, Klaus, Taylor, Andy, Wolf, Christian
We estimate and remove the contamination of weak gravitational lensing measurements by the intrinsic alignment of close pairs of galaxies. We do this by investigating both the aperture mass B mode...
Jogee, Shardha, Barazza, Fabio D., Rix, Hans-Walter, Shlosman, Isaac, Barden, Marco, Wolf, Christian, ...
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 times has yet to be...
MacDonald, Emily C., Allen, Paul, Dalton, Gavin, Moustakas, Leonidas A., Heymans, Catherine, Edmondson, Edward, ...
The Oxford-Dartmouth Thirty Degree Survey (ODTS) is a deep, wide, multiband imaging survey designed to cover a total of 30 deg2 in BVRi'Z, with a subset of U- and K-band data, in four separate fields...
MacDonald, Emily C., Allen, Paul, Dalton, Gavin, Moustakas, Leonidas A., Heymans, Catherine, Edmondson, Edward, ...
The Oxford-Dartmouth Thirty Degree Survey (ODTS) is a deep, wide, multiband imaging survey designed to cover a total of 30 deg2 in BVRi'Z, with a subset of U- and K-band data, in four separate fields...