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- W2014344168 abstract "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 -23<M_r<-18 and stellar mass within 5x10^9 M_sol<M_star<2x10^11 M_sol is found (h=0.73). Both bispectra exhibit a stronger signal for more luminous lenses or those with higher stellar mass (up to a factor 2-3). This is accompanied by a steeper equilateral bispectrum for more luminous or higher stellar mass lenses for the excess mass. Importantly, we find the excess mass to be very sensitive to galaxy type as recently predicted with semi-analytic galaxy models: luminous (M_r<-21) late-type galaxies show no detectable signal, while all excess mass detected for luminous galaxies seems to be associated with early-type galaxies. We also present the first observational constraints on third-order stochastic galaxy biasing parameters." @default.
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- W2014344168 date "2013-02-07" @default.
- W2014344168 modified "2023-09-26" @default.
- W2014344168 title "CFHTLenS: higher order galaxy–mass correlations probed by galaxy–galaxy–galaxy lensing" @default.
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- W2014344168 doi "https://doi.org/10.1093/mnras/stt069" @default.
- W2014344168 hasPublicationYear "2013" @default.