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Effects of large-scale structure on the accuracy of weak lensing mass measurements
Henk Hoekstra, Jan Hartlap, Stefan Hilbert +1
Weak gravitational lensing has become an important method to determine the masses of galaxy clusters. The intrinsic shapes of the galaxies are a dominant source of uncertainty, but…
Measuring primordial non-Gaussianity through weak lensing peak counts
Laura Marian, Stefan Hilbert, Robert E. Smith +2
We explore the possibility of detecting primordial non-Gaussianity of the local type using weak lensing peak counts. We measure the peak abundance in sets of simulated weak lensing…
A bias in cosmic shear from galaxy selection: results from ray-tracing simulations
Jan Hartlap, Stefan Hilbert, Peter Schneider +1
We identify and study a previously unknown systematic effect on cosmic shear measurements, caused by the selection of galaxies used for shape measurement, in particular the rejecti…
Reducing distance errors for standard candles and standard sirens with weak-lensing shear and flexion maps
Stefan Hilbert, Jonathan R. Gair, Lindsay J. King
Gravitational lensing induces significant errors in the measured distances to high-redshift standard candles and standard sirens such as type-Ia supernovae, gamma-ray bursts, and m…
Weak lensing from space: first cosmological constraints from three-point shear statistics
Elisabetta Semboloni, Tim Schrabback, Ludovic van Waerbeke +3
We use weak lensing data from the Hubble Space Telescope COSMOS survey to measure the second- and third-moments of the cosmic shear field, estimated from about 450,000 galaxies wit…