Zaino, A.A.ZainoVignali, C.C.VignaliSEVERGNINI, PaolaPaolaSEVERGNINIDELLA CECA, RobertoRobertoDELLA CECABallo, L.L.Ballo2020-09-022020-09-022017http://hdl.handle.net/20.500.12386/27040An efficient diagnostic method to find local (z<0.1) Compton-thick AGN consists in selecting sources characterized by hard X-ray colors and low X-ray to mid-IR flux ratio (HR vs. F_{X}/F_{IR}). This has been done efficiently in the past using 2XMM and IRAS data (Severgnini et al. 2012). I will here summarize my master thesis work, in which I tested the stability of the method outlined above using the latest 3XMM and WISE data, and I investigated its potentialities in finding interesting spectrally variable (including changing-look) XMM-Newton sources.ELETTRONICOenMultimediahttps://www.cosmos.esa.int/web/xmm-newton/2017-symposium2017xru..conf..341ZFIS/05 - ASTRONOMIA E ASTROFISICA