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...
Telescope Optics and Weak Lensing: PSF Patterns due to Low Order Aberrations (2008)
Jarvis, Mike, Schechter, Paul, Jain, Bhuvnesh
In weak lensing investigations, galaxy shapes are deconvolved for the effects of the point spread function (PSF) using stellar images. In this paper we use physical models of the telescope optics to...
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...
Richardson, Andrew, Boscari, Alexandre, Schreiber, Lukas, Kerstiens, Gerhard, Jarvis, Mike, Herzyk, Pawel, ...
The aim of the present study was to isolate clones of genes which are likely to be involved in wax deposition on barley leaves. Of particular interest were those genes which encode proteins that take...
On Combining Lensing Shear Information from Multiple Filters (2007)
We consider the possible gain in the measurement of lensing shear from imaging data in multiple filters. Galaxy shapes may differ significantly across filters, so that the same galaxy offers multiple...
Richardson, Andrew, Wojciechowski, Tobias, Franke, Rochus, Schreiber, Lukas, Kerstiens, Gerhard, Jarvis , Mike, ...
The developing leaf three of barley provides an excellent model system for the direct determination of relationships between amounts of waxes and cutin and cuticular permeance. Permeance of the...
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...
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...
PSF Anisotropy and Systematic Errors in Weak Lensing Surveys (2005)
Jain, Bhuvnesh, Jarvis, Mike, Bernstein, Gary
Given the basic parameters of a cosmic shear weak lensing survey, how well can systematic errors due to anisotropy in the point spread function (PSF) be corrected? The largest source of error in this...
Richardson, Andrew, Franke , Rochus, Kerstiens, Gerhard, Jarvis, Mike, Schreiber, Lukas, Fricke , Wieland
In grasses, leaf cells divide and expand within the sheaths of older leaves, where the micro-environment differs from the open atmosphere. By the time epidermal cells are displaced into the...
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...
Dark Energy Constraints from the CTIO Lensing Survey (2005)
Jarvis, Mike, Jain, Bhuvnesh, Bernstein, Gary, Dolney, Derek
We perform a cosmological parameter analysis of the 75 square degree CTIO lensing survey in conjunction with CMB and Type Ia supernovae data. For Lambda CDM cosmologies, we find that the amplitude of...
Principal Component Analysis of PSF Variation in Weak Lensing Surveys (2004)
We introduce a new algorithm for interpolating measurements of the point-spread function (PSF) using stars from many exposures. The principal components of the variation in the PSF pattern from...