Dual/binary Supermassive Black Hole ( SMBH ) systems are the inevitable consequence of the current \Lambda Cold Dark Matter cosmological paradigm .
In this 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 candidate on the basis of the presence of double-peaked [ OIII ] emission lines in its optical spectrum .
MCG+11-11-032 is also an X-ray variable source and was observed several times by the Swift X-ray Telescope ( XRT ) on time scales from days to years .
In this work , we analyze the SDSS-DR13 spectrum and find evidence for double-peaked profiles in all the strongest narrow emission lines .
We also study the XRT light curve and unveil the presence of an alternating behavior of the intrinsic 0.3-10 keV flux , while the 123-month Swift BAT light curve supports the presence of almost regular peaks and dips almost every 25 months .
In addition , the XRT spectrum suggests for the presence of two narrow emission lines with rest-frame energies of E \sim 6.16 keV and E \sim 6.56 keV .
Although by considering only the optical emission lines , different physical mechanisms may be invoked to explain the kinematical properties , the X-ray results are most naturally explained by the presence of a binary SMBH in the center of this source .
In particular , we evidence a remarkable agreement between the putative SMBH pair orbital velocity derived from the BAT light curve and the velocity offset derived by the rest–frame \Delta E between the two X-ray line peaks in the XRT spectrum ( i.e . \Delta v \sim 0.06 c ) .