Orateur
Description
In Sunyaev Zeldovich (SZ) cluster cosmology, one of the main parameter of interest is cluster mass. It is needed to constrain cosmological parameters through the cluster number count. As the mass is not an observable, a scaling relation is needed to link cluster masses to the integrated Compton parameters Y, i.e the SZ observable.
Current cosmological results use the Planck scaling relation obtained with clusters at low redshift (z<0.5) observed in SZ and X-ray.
In the SZ Large Program (LPSZ) of the NIKA2 collaboration, the scaling relation can be obtained with a sample of 45 clusters at high redshift (from z=0.5 to z=0.9) and observed at high resolution both in SZ and X-ray. From these data, it will be possible to study various systematic effects that can affect the scaling relation.
For this purpose, several galaxy cluster samples have been simulated with gNFW pressure profiles and Compton maps similar to the NIKA2 ones. In addition, to quantify the impact of the cluster dynamical state, different features have been applied to the simulated sample (overpressure, non-sphericity, substructures, …). Their impact on the scaling parameter estimation has been studied.
In this talk, I will present the various systematic effects that can affect the Y-M scaling relation used in SZ cluster cosmology.
