The environment of AGN along the quasar main sequence

The analysis was carried out for a sample of 680 AGN, chose along the quasar main sequence, so with different values of H_beta FWHM. Was considered an area around each source of 0.5 Mpc, in which we analyzed the behaviour of the objects inside that area. Were kept only galaxies and AGN as possible closer companions, instead the other objects which are contaminants were discarded. Were performed some analyses in order to understand if each object is really a closer companion or only a backgroud/foreground sorce. The principal aim is to investigate if the physical companions may affect the evolution and the behaviour of the source at the centre, and undertand what are the difference, based on the environment, of the sources along the main sequence. Different statistical analyses were performed, in order to avoid any sort of false positive in the companions research, and to make a correction on the studies.