Substructures in clusters of galaxies / Estudo de subestruturas em aglomerados de Galáxias
AUTOR(ES)
Brigitte Tomé Lehodey
DATA DE PUBLICAÇÃO
2000
RESUMO
This dissertation presents two methods for the detection of substructures in clusters of galaxies and the results of their application to a group of 4 clusters. In chapters 2 and 3, we remember the main properties of clusters of galaxies and give the definition of substructures. We also try to show why the study of substructures in clusters of galaxies is so important for Cosmology. Chapters 4 and 5 describe these two methods, the first one, the adaptative Kernel, is applied to the study of the spatial and kinematical distribution of the cluster galaxies. The second one, the MVM (Multiscale Vision Model), is applied to analyse the cluster diffuse X-ray emission, that is to say, the intracluster gas distribution. At the end of these two chapters, we also present the results of the application of these methods to our sample of clusters. In chapter 6, we draw the conclusions from the comparison of the results we obtain with each method. In the last chapter, we present the main conclusions of this work trying to point out possible developments. We close with two appendices in which we detail some questions raised in this work not directly linked to the problem of substructures detection.
ASSUNTO(S)
matéria escura x ray dark matter emisson raios x astrofÍsica wavelet analysis galaxias galaxies análise wavelets galactic clusters aglomerados de galáxias emissão
