The impact of spiral density waves on the star formation distribution: a
  view from core-collapse supernovae
  We present an analysis of the impact of spiral density waves (DWs) on the
radial and surface density distributions of core-collapse (CC) supernovae (SNe)
in host galaxies with different arm classes. For the first time, we show that
the corotation radius normalized surface density distribution of CC SNe
(tracers of massive star formation) indicates a dip at corotation in long-armed
grand-design (LGD) galaxies. The high SNe surface density just inside and
outside corotation may be the sign of triggered massive star formation by the
DWs. Our results may support the large-scale shock scenario induced by spiral
DWs in LGD galaxies, which predicts a higher star formation efficiency around
the shock fronts, avoiding the corotation region.
