Density split statistics: joint model of counts and lensing in cells

Understand

We present density split statistics, a framework that studies lensing and counts-in-cells as a function of foreground galaxy density, thereby providing a large-scale measurement of both 2-point and 3-point statistics.

• Our method extends our earlier work on trough lensing and is summarized as follows: given a foreground (low redshift) population of galaxies, we divide the sky into subareas of equal size but distinct galaxy density.
• We then measure lensing around uniformly spaced points separately in each of these subareas, as well as counts-in-cells statistics (CiC).
• The lensing signals trace the matter density contrast around regions of fixed galaxy density.