Anisotropic effective redshift and evolving clustering amplitude

Abstract A typical galaxy survey geometry results in pairs of different separation and angle to the line-of-sight having distributions redshift consequently a effective redshift. However, clustering measurements are analysed assuming that is representative at single We investigate impact variations galaxy-pair on large-scale measured surveys. find surveys spanning large range have redshifts as function both pair angle. Furthermore, when considering tracers whose amplitude evolves strongly with redshift, this combination can result an additional scale-dependent anisotropy. demonstrate size effect eBOSS DR16 Quasar sample show that, while monopole negligible, neglecting tilt ? 4% ?40% quadrupole hexadecapole, respectively, scales ?1 h -1 Gpc. discuss strategies mitigate making measurements.