| Popis: |
In this thesis it has been treated the physical process called dynamical friction, which is responsible for the decay of massive objects traveling in systems composed by lighter particles, such as a Globular Cluster traveling in a Galaxy or massive stars moving in stellar systems. After a careful validation, the treatment it has been applied to real astrophysical objects on different scales. On small scales, it has been provided a study on the possible formation of Intermediate Mass Black Holes in Globular Clusters, as results of the decaying and merging of massive stars within the center of the clusters. Considering larger scales, it has been studied the evolution of the Globular Cluster System belonging to the dwarf spheroidal galaxy known as Fornax, giving a possible solution to the so-called ”Fornax timing problem” and providing a wide set of initial condition for the clusters which allows to predict with good approximation their observed positions. Moreover, it has been studied the formation in the center of galaxies of dense, massive clusters, commonly referred as Nuclear Star Clusters. In particular, the work made here is based on the so-called ”dry merger scenario”, in which this central super- cluster has been formed by the merging of decaying Globular Clusters. Using statistical and analytical arguments, it has been possible to provide scaling laws, which connects the Nuclear Star Cluster mass with the host global properties, in excellent agreement with observed scaling laws. In the last part of the thesis, it has been studied the problem of the lacking of Nuclear Star Clusters in galaxies whose masses are above ten billion of solar masses. Using a wide set of direct N-body simulations, it has been demonstrated that the tidal effects induced by a central Super Massive Black Holes could leads to the total disruption of the building blocks of the central super clusters, i.e. the Globular Clusters, suppressing, or even preventing at all, the formation of a Nuclear Star Clusters. |
