Cluster mass profile reconstruction with size and flux magnification on theHSTSTAGES survey.
We present the first measurement of individual cluster mass estimates using weak lensing size and flux magnification. Using data from theHSTSTAGES (Space Telescope A901/902 Galaxy Evolution Survey) survey of the A901/902 supercluster we detect the four known groups in the supercluster at high significance using magnification alone. We discuss the application of a fully Bayesian inference analysis, and investigate a broad range of potential systematics in the application of the method. We compare our results to a previous weak lensing shear analysis of the same field finding the recovered signal-to-noise of our magnification-only analysis to range from 45 to 110 per cent of the signal-to-noise in the shear-only analysis. On a case-by-case basis we find consistent magnification and shear constraints on cluster virial radius, and finding that for the full sample, magnification constraints to be a factor 0.77 ± 0.18 lower than the shear measurements.
Scottish Universities Physics Alliance, Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK.
Christopher A J
CA
Duncan
Scottish Universities Physics Alliance, Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK.
Catherine
C
Heymans
Imperial Centre for Inference and Cosmology, Department of Physics, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK.
Alan F
AF
Heavens
Department of Physics and Astronomy, University College London, Gower Place, London WC1E 6BT, UK.
Benjamin
B
Joachimi
dark matter; galaxies: clusters: general; gravitational lensing: weak; methods: data analysis