Mapping the 3D dark matter with weak lensing in COMBO-17

摘要: We present a three-dimensional (3D) lensing analysis of the z = 0.16 supercluster A901/2, resulting in 3D map dark matter distribution within 3 x 10 5 [h -1 Mpc] volume. This is generated from combined catalogue galaxy coordinates together with shear estimates, using R-band imaging and photometric redshifts COMBO-17 survey. perform X 2 fit isothermal spheres to tangential pattern around each cluster as function redshift estimate positions masses main clusters alone. Motivated by appearance second behind A902 number density, we also two-cluster model A902. then first dark-matter gravitational potential field, Φ, weak Kaiser-Squires Taylor inversion methods. These maps clearly show wells components, including new A902, demonstrate applicability mapping projection-free, mass-selected finding current data. Finally, develop halo clustering compare this auto- cross-correlation functions potential, densities luminosity measured A901/2 field. find significant anticorrelations between field density luminosities, expected due baryonic infall into concentrations. good agreement for correlation functions, but some disagreement shape function, which attribute finite-field effects.