Exploring the properties of galaxy clusters with hydrodynamical simulations: the MUSIC dataset

by Federico Sembolini (Universidad Autonoma de Madrid - Spain)

Thursday 30 May 2013, 16:00 → 18:00 Europe/Rome

Aula Conversi (Dipartimento di Fisica - Ed. G. Marconi)

I will introduce the MUSIC dataset (Marenostrum-MUltiDarkSimultations of galaxy Clusters) - presently the largest sample of hydrodynamically simulated galaxy clusters, comprised of more than 700 clusters and 2000 groups. The analysis of the baryon content (gas and stars) of the most massive clusters of the MUSIC dataset, performed as a function of aperture radius and redshift, is compared with the most recent observational estimates of the gas fraction in galaxy clusters, showing a good agreement when the effects of cooling and stellar feedbacks are included. I will also present a detailed analysis of the scaling relations of the thermal SZ (Sunyaev-Zel'dovich) effect derived from MUSIC clusters. The integrated SZ brightness, Y, is one of the best observational proxies used to infer the total cluster mass, M, as SZ observations allow exploration of regions of clusters not reachable by present X-ray experiments. A possible redshift dependence on the Y-M scaling relatio, extending the analysis to protoclusters, objects typically at redshift higher than 1, is studied. The analysis of the scaling relations of MUSIC clusters is completed by estimating the X-ray properties of the objects using PHOX, in order to explore the relationship between galaxy clusters properties with different observational approaches, as the X-band is considered to be the observational counterpart of the SZ effect.