Compton-thick AGN in the NuSTAR Era. VIII. A joint NuSTAR–XMM-Newton Monitoring of the Changing-look Compton-thick AGN NGC 1358

We present the multi-epoch monitoring with NuSTAR and XMM-Newton of NGC 1358, a nearby Seyfert 2 galaxy whose properties made it promising candidate X-ray changing look AGN, i.e., source column density could transition from its 2017 Compton-thick (CT-, having line-of-sight Hydrogen NH,los>10^24 cm^-2) state to Compton-thin (NH,los<10^24 one. The confirmed presence significant NH,los variability over time-scales as short weeks, allowed us confirm "changing look" nature which has most recently been observed in status. Multi-epoch is demonstrated be highly effective simultaneously constraining three otherwise degenerate parameters: torus average covering factor, inclination angle between axis observer. find tentative anti-correlation luminosity, can understood framework Chaotic Cold Accretion clouds driving recursive AGN feedback. campaign 1358 proven efficiency our newly developed method select NH,los-variable, heavily obscured we plan soon extend larger sample better characterize obscuring material surrounding accreting supermassive black holes, well constrain feeding models.