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NGC 3115 is an S0 galaxy that has always been considered to have a pureabsorption-line spectrum. Some recent studies have detected a compactradio-emitting nucleus in this object, coinciding with the photometric centerand with a candidate for the X-ray nucleus. This is evidence of the existenceof a low-luminosity active galactic nucleus (AGN) in the galaxy, although noemission line has ever been observed. We report the detection of anemission-line spectrum of a type 1 AGN in NGC 3115, with an H$\alpha$luminosity of $L_{H\alpha} = (4.2 \pm 0.4) \times 10^{37}$ erg s$^{-1}$. Ouranalysis revealed that this AGN is located at a projected distance of $\sim0.29" \pm 0.05"$ (corresponding to $\sim 14.3 \pm 2.5$ pc) from the stellarbulge center, which is coincident with the kinematic center of this object'sstellar velocity map. The black hole corresponding to the observed off-centeredAGN may form a binary system with a black hole located at the stellar bulgecenter. However, it is also possible that the displaced black hole is themerged remnant of the binary system coalescence, after the "kick" caused by theasymmetric emission of gravitational waves. We propose that certain features inthe stellar velocity dispersion map are the result of perturbations caused bythe off-centered AGN.

An off-centered active galactic nucleus in NGC 3115