Evolution of the dark matter distribution with three-dimensional weak lensing |
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| Authors: | D J Bacon A N Taylor M L Brown M E Gray C Wolf K Meisenheimer S Dye L Wisotzki A Borch M Kleinheinrich |
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| Institution: | Institute for Astronomy, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD;Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH;Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany;Astrophysics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BW;Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany |
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| Abstract: | We present a direct detection of the growth of large-scale structure, using weak gravitational lensing and photometric redshift data from the COMBO-17 survey. We use deep R -band imaging of two 0.5 × 0.5 deg2 fields, affording shear estimates for over 52 000 galaxies; we combine these with photometric redshift estimates from our 17-band survey, in order to obtain a 3D shear field. We find theoretical models for evolving matter power spectra and correlation functions, and fit the corresponding shear correlation functions to the data as a function of redshift. We detect the evolution of the power at the 4.7σ level given reasonable priors, and measure the rate of evolution for 0 < z < 1 . We also fit correlation functions to our 3D data as a function of cosmological parameters σ8 and ΩΛ . We find joint constraints on ΩΛ and σ8, demonstrating an improvement in accuracy by ?40 per cent over that available from 2D weak lensing for the same area. |
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| Keywords: | gravitational lensing cosmological parameters dark matter large-scale structure of Universe |
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