088055

This proposal aims at catching comma for the first time comma fast openParhour time scaleclosePar variability in two RQ AGN simultaneously in X-ray and millimeter wavelength. A NOEMA proposal has been submitted at the last AO openPar10 Sept. 2020closePar and we ask in this proposal for 50 ks per object of openParstrictly simultaneousclosePar XMM time. Hour time-scale variability corresponds to 10-100 gravitational radii light travel time around a supermassive black hole of 10elev7 Msun. A correlated variability observed between both wavelengths would be a direct proof that the mm emission in RQ AGN is produced very close to the black hole comma in a region consistent with the so-called X-ray hot corona.