The MUSIC of Galaxy Clusters – III. Properties, evolution and Y–M scaling relation of protoclusters of galaxies

摘要: ABSTRACT In this work we study the properties of protoclusters galaxies by employing MUSIC setof hydrodynamical simulations, featuring a mass-limited sample 282 resimulated clusterswith available merger trees up to high redshift, and trace cluster formation back z= 1.5, 2.3 4. We features redshift evolution mass spatial dis-tribution for all progenitors protoclusters, which define as mostmassive clusters identified at z = 0. A natural extension redshifts largerthan 1 is applied estimate baryon content also in terms gas stars bud-gets: no remarkable variations with are discovered. Furthermore, motivated theproven potential Sunyaev-Zel’dovich surveys blindly search faint distant objects, wefocus on scaling relation between total object integrated Compton y-parameter,and check possibility extend mass-observable paradigm protoclusterregime, far beyond 1, account simulated objects.We find that slope law steeper than what expected self-similarityassumption among these it increases mainly synthetic clus-ters where radiative processes, such cooling, heating processes due toUV background, star supernovae feedback, included. use three differentcriteria dynamical state significant depen-dence parameters from level relaxation. Based this, exclude thatthe cause observed deviations self-similarity.Key words: methods: numerical – galaxies: cosmology cosmology: theory –cosmology : miscellaneous