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We present new spectroscopic identifications of 12 X-shaped radio galaxiesand use the spectral data to derive starburst histories and masses of thenuclear supermassive black holes in these galaxies. The observations were donewith the 2.1-m telescope of the Observatorio Astron\'omico Nacional at SanPedro M\'artir, M\'exico. The new spectroscopic results extend the sample ofX-shaped radio galaxies studied with optical spectroscopy. We show that thecombined sample of the X-shaped radio galaxies has statistically higherblack-hole masses and older episodes of star formation than a control sample ofcanonical double-lobed radio sources with similar redshifts and luminosities.The data reveal enhanced star-formation activity in the X-shaped sample on thetimescales expected in galactic mergers. We discuss the results obtained in theframework of the merger scenario.

Starbursts and black hole masses in X-shaped radio galaxies: Signatures of a merger event?