On the impact of lensing magnification on redshift-space galaxy clustering analysis.

We study the impact of lensing magnification on the observed redshift-space three-dimensional galaxy clustering. For this, we use the RayGal suite of $N$-body simulations, from which we extract samples of dark matter particles and haloes in the redshift regime of interest for future large redshift surveys. Several magnitude-limited samples are built that reproduce various levels of magnification bias ranging from $s=0$ to $s=1.2$, where $s$ is the logarithmic slope of the cumulative magnitude number counts, in three redshift intervals within $1 1.3$ and can reach 10\% at $z\simeq 1.8$, depending on the properties of the target sample. However, adding the lensing linear correction allows us to recover an unbiased estimation of the growth rate in most cases, even when the fiducial cosmology is not that of the data. Our results show the importance of knowing in advance $s$ instead of letting this parameter free with flat priors, since in this case the error bars significantly increase. For large values of $s$, we find that one has to be careful with the weak-lensing limit, as it may not be a good approximation at high redshift.