Merging Systems Identification in Systems of Galaxies

MARIANO JAVIER DE LEON DOMINGUEZ ROMERO; MARTIN DE LOS RIOS; DANTE PAZ; DIEGO GARCIA LAMBAS

Cambridge, Ma

Congreso; Debates on the nature of dark matter; 2014

Harvard University

he Bullet Cluster and many other examples of merging systems provided observational evidence for the existence of dark matter. Most of them have been used to test the Cold Dark Matter (CDM) paradigm itself. The presence of DM and constraints on its self-interaction cross section can therefore be inferred by measuring a spatial offset between the X-ray emission of the ICM plasma and its total mass distribution.\\ Using a combination of test (Dressler Schectman (1988) and Mixture of Gaussians) designed to detect substructures, we are able to define samples of merging systems with high levels of completitude, low contamination and almost exact definition of the center position. Using simulated SDSS galaxy catalogs we could known under which conditions our algorithms identify real mergers and therefore avoid false substructures identifications in real catalogs.