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We study the effects of bulge elongation on the star formation activity inthe centers of spiral galaxies using the data from the Sloan Digital Sky SurveyData Release 7. We construct a volume-limited sample of face-on spiral galaxieswith $M_r < -$19.5 mag at 0.02 $\leq z <$ 0.055 by excluding barred galaxies,where the aperture of the SDSS spectroscopic fibre covers the bulges of thegalaxies. We adopt the ellipticity of bulges measured by Simard et al. (2011)who performed two-dimensional bulge+disc decompositions using the SDSS imagesof galaxies, and identify nuclear starbursts using the fibre specific starformation rates derived from the SDSS spectra. We find a statisticallysignificant correlation between bulge elongation and nuclear starbursts in thesense that the fraction of nuclear starbursts increases with bulge elongation.This correlation is more prominent for fainter and redder galaxies, whichexhibit higher ratios of elongated bulges. We find no significant environmentaldependence of the correlation between bulge elongation and nuclear starbursts.These results suggest that non-axisymmetric bulges can efficiently feed the gasinto the centre of galaxies to trigger nuclear starburst activity.

Nuclear starburst activity induced by elongated bulges in spiral galaxies