Cosmology dependence of galaxy cluster scaling relations
Abstract
The abundance of galaxy clusters as a function of mass and redshift is a well known powerful cosmological probe, which relies on underlying modelling assumptions on the massobservable relations (MOR). Some of the MOR parameters can be constrained directly from multiwavelength observations, as the normalization at some reference cosmology, the massslope, the redshift evolution, and the intrinsic scatter. However, the cosmology dependence of MORs cannot be tested with multiwavelength observations alone. We use magneticum simulations to explore the cosmology dependence of galaxy cluster scaling relations. We run fifteen hydrodynamical cosmological simulations varying Ω_{m}, Ω_{b}, h_{0}, and σ_{8} (around a reference cosmological model). The MORs considered are gas mass, baryonic mass, gas temperature, Y and velocity dispersion as a function of virial mass. We verify that the mass and redshift slopes and the intrinsic scatter of the MORs are nearly independent of cosmology with variations significantly smaller than current observational uncertainties. We show that the gas mass and baryonic mass sensitively depends only on the baryon fraction, velocity dispersion, and gas temperature on h_{0}, and Y on both baryon fraction and h_{0}. We investigate the cosmological implications of our MOR parametrization on a mock catalogue created for an idealized eROSITAlike experiment. We show that our parametrization introduces a strong degeneracy between the cosmological parameters and the normalization of the MOR. Finally, the parameter constraints derived at different overdensity (Δ_{500c}), for Xray bolometric gas luminosity, and for different subgrid physics prescriptions are shown in the appendix.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 May 2020
 DOI:
 10.1093/mnras/staa1004
 arXiv:
 arXiv:1911.05751
 Bibcode:
 2020MNRAS.494.3728S
 Keywords:

 largescale structure of Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 15 pages, 8 figures, 8 tables. Accepted for publication in MNRAS