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We present Keck/ESI long-slit spectroscopy of SBS 1421+511, a systemconsisting of a quasar at z = 0.276 and an extended source 3" northern to thequasar. The quasar shows a blue-skewed profile of Balmer broad emission lines,which can be well modeled as emissions from a circular disk with a blueshiftvelocity of ~1400 km/s. The blueshift is better interpreted as resulting from arecoiling active black hole than from a super-massive black hole binary, sincethe line profile almost kept steady over one decade in the quasar rest-frame.Alternative interpretations are possible as well, such as emissions from abipolar outflow or a circular disk with spiral emissivity perturbations. Theextended source shows Seyfert-like narrow line ratios and a [OIII] luminosityof >1.4\times10^8L_\odot, with almost the same redshift as the quasar and aprojected distance of 12.5 kpc at the redshift. SBS 1421+511 is thus likely tobe an interacting galaxy pair with dual AGN. Alternatively, the quasarcompanion only appears to be active but not necessarily so: the gasbefore/in/behind the companion galaxy is illuminated by the quasar as anextended emission line region is detected at a similar distance in the oppositedirection southern to the quasar, which may be generated either by tidalinteractions between the galaxy pair or large-scale outflows from the quasar.

Keck/ESI Long-slit Spectroscopy of SBS 1421+511: A Recoiling Quasar Nucleus in An Active Galaxy Pair?