The dynamics of a large stellar cluster containing N = 128,000 stars has been simulated by a direct summation (O(N2)) method by using a hyper-systolic algorithm on a heterogeneous platform. Preliminary simulations have been carried out on model systems with and without the presence, in their center, of a black hole whose mass has been varied from 0.02 to 0.1 times the total mass of the cluster. These simulations followed the evolution of the globular cluster in order to describe its dynamics over an interval of time up to 20 crossing times. The platform heterogeneity, allowing a very efficient use of the computational resources, can be considered a key feature for sustaining large computational loads. Our results show that the massive object in the center of the cluster plays an important role in altering quickly the surrounding star distribution, causing a sort of ``violent relaxation'' while the following evolution occurs via two-body collisional relaxation.
Direct simulations of globular clusters with N=128K stars and central black holes / CAPUZZO DOLCETTA, Roberto Angelo; V., Rosato; N., Pucello. - STAMPA. - 18:(2001), pp. 158-158. (Intervento presentato al convegno nnual Scientific Meeting of the Astronomische Gesellschaft at the Joint European and National Meeting JENAM 2001 of the European Astronomical Society and the Astronomische Gesellschaft tenutosi a Munich (Germany) nel 10-15 September 2001).
Direct simulations of globular clusters with N=128K stars and central black holes
CAPUZZO DOLCETTA, Roberto Angelo;
2001
Abstract
The dynamics of a large stellar cluster containing N = 128,000 stars has been simulated by a direct summation (O(N2)) method by using a hyper-systolic algorithm on a heterogeneous platform. Preliminary simulations have been carried out on model systems with and without the presence, in their center, of a black hole whose mass has been varied from 0.02 to 0.1 times the total mass of the cluster. These simulations followed the evolution of the globular cluster in order to describe its dynamics over an interval of time up to 20 crossing times. The platform heterogeneity, allowing a very efficient use of the computational resources, can be considered a key feature for sustaining large computational loads. Our results show that the massive object in the center of the cluster plays an important role in altering quickly the surrounding star distribution, causing a sort of ``violent relaxation'' while the following evolution occurs via two-body collisional relaxation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
