1301.1863 (P. Simon et al.)

CFHTLenS: Higher-order galaxy-mass correlations probed by galaxy-galaxy-galaxy lensing    [PDF]

P. Simon, T. Erben, P. Schneider, C. Heymans, H. Hildebrandt, H. Hoekstra, T. D. Kitching, Y. Mellier, L. Miller, L. Van Waerbeke, C. Bonnett, J. Coupon, L. Fu, M. J. Hudson, K. Kuijken, B. T. P. Rowe, T. Schrabback, E. Semboloni, M. Velander

We present the first direct measurement of the galaxy-matter bispectrum as a function of galaxy luminosity, stellar mass, and SED type. Our analysis uses a galaxy-galaxy-galaxy lensing technique (G3L), on angular scales between 9 arcsec to 50 arcmin, to quantify (i) the excess surface mass density around galaxy pairs (excess mass hereafter) and (ii) the excess shear-shear correlations around single galaxies, both of which yield a measure of two types of galaxy-matter bispectra. We apply our method to the state-of-the-art Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), spanning 154 square degrees. This survey allows us to detect a significant change of the bispectra with lens properties. Measurements for lens populations with distinct redshift distributions become comparable by a newly devised normalisation technique. That will also aid future comparisons to other surveys or simulations. A significant dependence of the normalised G3L statistics on luminosity within -23View original: http://arxiv.org/abs/1301.1863