Context. The Intra-Cluster Medium is characterized by thermal emission, and by the presence of large scale magnetic fields. In some clusters of galaxies a diffuse non-thermal emission is also present, located at the cluster center and named radio halo. These sources indicate the existence of relativistic particles and magnetic fields in the cluster volume. Aims. In this paper we collect data on...

Diffuse radio emission in galaxy clusters is known to be related to cluster mass and cluster dynamical state. We collect the observed fluxes of radio halos, relics, and mini-halos for a sample of galaxy clusters from the literature, and calculate their radio powers. We then obtain the values of cluster mass or mass proxies from previous observations, and also obtain the various dynamical parame...

High-resolution N-body simulations of hierarchical clustering in a wide variety of cos-mogonies show that the density prooles of dark matter halos are universal, with low mass halos being denser than their more massive counterparts. This mass-density correlation is interpreted as reeecting the earlier typical formation time of less massive objects. We investigate this hypothesis in the light of...

We study the angular momentum profile of dark matter halos for a statistical sample drawn from a set of high-resolution cosmological simulations of 256 3 particles. Two typical Cold Dark Matter (CDM) models have been analyzed, and the halos are selected to have at least 3 × 10 4 particles in order to reliably measure the angular momentum profile. In contrast with the recent claims of Bullock et...

In this letter we present a morphological comparison between giant radio halos and radio mini-halos in galaxy clusters based on radio–X-ray luminosity, P1.4-LX, and radio luminosity-size, P1.4-RH, correlations. We report evidence that P1.4-LX and P1.4-RH trends may also exist for mini–halos: mini–halo clusters share the same region of giant halo clusters in the (P1.4, LX) plane, whereas they ar...

Adaptive SPH and N-body simulations were carried out to study the collapse and evolution of dark matter halos that result from the gravitational instability and fragmentation of cosmological pancakes. Such halos resemble those formed by hierarchical clustering from realistic initial conditions in a CDM universe and, therefore, serve as a convenient testbed model for studying halo dynamics. Our ...

We use a novel statistical tool, the mark correlation functions (MCFs), to study clustering of galaxysize halos as a function of their properties and environment in a high-resolution numerical simulation of the ΛCDM cosmology. We applied MCFs using several types of continuous and discrete marks: maximum circular velocity of halos, merger mark indicating whether halos experienced or not a major ...

Many galaxy clusters host Megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium. Correlations between the synchrotron power of radio halos and the thermal properties of the hosting clusters were established in the last decade, including the connection between the presence of a halo and cluster mergers. The X-ray luminosity and redshift limi...