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Dual/binary Supermassive Black Hole (SMBH) systems are the inevitableconsequence of the current Lambda Cold Dark Matter cosmological paradigm. Inthis context, we discuss here the properties of MCG+11-11-032, a local(z=0.0362) Seyfert 2 galaxy. This source was proposed as a dual AGN candidateon the basis of the presence of double-peaked [OIII] emission lines in itsoptical spectrum. MCG+11-11-032 is also an X-ray variable source and wasobserved several times by the Swift X-ray Telescope (XRT) on time scales fromdays to years. In this work, we analyze the SDSS-DR13 spectrum and findevidence for double-peaked profiles in all the strongest narrow emission lines.We also study the XRT light curve and unveil the presence of an alternatingbehavior of the intrinsic 0.3-10 keV flux, while the 123-month Swift BAT lightcurve supports the presence of almost regular peaks and dips almost every 25months. In addition, the XRT spectrum suggests for the presence of two narrowemission lines with rest-frame energies of E~6.16 keV and E~6.56 keV. Althoughby considering only the optical emission lines, different physical mechanismsmay be invoked to explain the kinematical properties, the X-ray results aremost naturally explained by the presence of a binary SMBH in the center of thissource. In particular, we evidence a remarkable agreement between the putativeSMBH pair orbital velocity derived from the BAT light curve and the velocityoffset derived by the rest-frame Delta_E between the two X-ray line peaks inthe XRT spectrum (i.e. Delta_v~0.06c).

Swift data hint at a binary Super Massive Black Hole candidate at sub-parsec separation