Publication details for Prof Richard MasseyMassey, R., Rhodes, J., Refregier, A., Albert, J., Bacon, D., Bernstein, G., Ellis, R., Jain, B., McKay, T., Perlmutter, S. & Taylor, A. (2004). Weak lensing from space. II. Dark matter mapping. Astronomical journal 127(6): 3089-3101.
- Publication type: Journal Article
- ISSN/ISBN: 0004-6256, 1538-3881
- DOI: 10.1086/420985
- Keywords: Dark matter, Gravitational lensing, Large-scale structure of Universe, Space vehicles.
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
We study the accuracy with which weak-lensing measurements could be made from a future space-based survey, predicting the subsequent precision of three-dimensional dark matter maps, projected two-dimensional dark matter maps, and mass-selected cluster catalogs. As a baseline, we use the instrumental specifications of the SuperNova/Acceleration Probe (SNAP) satellite. We first compute its sensitivity to weak lensing shear as a function of survey depth. Our predictions are based on detailed image simulations created using "shapelets," a complete and orthogonal parameterization of galaxy morphologies. We incorporate a realistic redshift distribution of source galaxies and calculate the average precision of photometric redshift recovery using the SNAP filter set to be Δz = 0.034. The high density of background galaxies resolved in a wide space-based survey allows projected dark matter maps with an rms sensitivity of 3% shear in 1 arcmin2 cells. This will be further improved using a proposed deep space-based survey, which will be able to detect isolated clusters using a three-dimensional lensing inversion technique with a 1 σ mass sensitivity of approximately 1013 M⊙ at z = 0.25. Weak-lensing measurements from space will thus be able to capture non-Gaussian features arising from gravitational instability and map out dark matter in the universe with unprecedented resolution.