Abstract / Description of output
We present the first direct measurement of the galaxy-matter bispectrum as a function of galaxy luminosity, stellar mass and type of spectral energy distribution (SED). Our analysis uses a galaxy-galaxy-galaxy lensing technique (G3L), on angular scales between 9 arcsec and 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 normalization technique. That will also aid future comparisons to other surveys or simulations. A significant dependence of the normalized G3L statistics on luminosity within -23
Original language | English |
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Pages (from-to) | 2476-2498 |
Number of pages | 23 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 430 |
Issue number | 3 |
DOIs | |
Publication status | Published - Apr 2013 |
Keywords / Materials (for Non-textual outputs)
- gravitational lensing: weak
- galaxies: haloes
- darkmatter
- large-scale structure of Universe
- DARK-MATTER HALOS
- 3-POINT CORRELATION-FUNCTION
- DIGITAL SKY SURVEY
- BONN DEEP SURVEY
- COSMIC SHEAR
- STATISTICAL-ANALYSIS
- SHAPE MEASUREMENT
- STELLAR MASS
- WEAK
- BIAS