The effect of redshift-space distortions on projected 2-pt clustering measurements

Understand

Although redshift-space distortions only affect inferred distances and not angles, they still distort the projected angular clustering of galaxy samples selected using redshift dependent quantities.

• From an Eulerian view-point, this effect is caused by the apparent movement of galaxies into or out of the sample.
• From a Lagrangian view-point, we find that projecting the redshift-space overdensity field over a finite radial distance does not remove all the anisotropic distortions.
• We investigate this effect, showing that it strongly boosts the amplitude of clustering for narrow samples and can also reduce the significance of baryonic features in the correlation function.