Simulações de sloshing do aglomerado de galáxias Abell 1644

• Ano de defesa: 2019
• Autor(a) principal: Doubrawa, Lia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Curitiba; Brasil; Programa de Pós-Graduação em Física e Astronomia; UTFPR
• Palavras-chave em Português: Galáxias - Aglomerados; Colisões (Física); Raios X; Galáxias - Modelos matemáticos; Astronomia - Observações; Cosmologia; Métodos de simulação; Física; Galaxies - Clusters; Collisions (Physics); X-ray; Galaxies - Mathematical models; Astronomy - Observations; Cosmology; Simulation method; Physics; CNPQ::CIENCIAS EXATAS E DA TERRA::ASTRONOMIA
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/4358

Recent collision events between galaxy clusters exhibit peculiar morphologies in the intracluster medium. That seems to be the case of Abell 1644, a nearby galaxy cluster (z = 0:047), composed by three main structures: the southern cluster that shows a spiral-like morphology A1644S, the northern cluster seen in X-ray observations A1644N1, and the recently discovered substructure A1644N2. By means of N-body hydrodynamical simulations, we attempt to reconstruct the dynamical history of the system. These simulations resulted in two specific scenarios: (i) The collision between A1644S and A1644N2, with an inclination in relation to the plane of the sky of 20∘. Our best model reaches the best morphology 2 Gyr after the pericentric passage, and shows a good agreement with observations; (ii) The collision between A1644S and A1644N1. This scenario was evaluated in two instants of time: in the first passage after the pericentric passage; and after apoapsis, when the cluster returns when reaching the maximum separation. This approach of collision between A1644S/N1 did not give rise to results as satisfactory as the scenario A1644S/N2, due to great disturbances in density and mismatching temperature maps. As a complementary study, we perform a three-cluster simulation using as base the best-fitting model A1644S/N2. We tried to reproduce the current state of A1644 with the three main structures, resulting in a good agreement to the global morphology of the observations. Thus, we find that the more likely scenario is a collision between A1644S and A1644N2, where A1644N1 may be present as long as it does not greatly interfere in the formation of the spiral feature.