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We present new $^{12}$CO(J=1-0) observations of the barred galaxy NGC 4303using the Nobeyama 45m telescope (NRO45) and the Combined Array for Research inMillimeter-wave Astronomy (CARMA). The H$\alpha$ images of barred spiralgalaxies often show active star formation in spiral arms, but less so in bars.We quantify the difference by measuring star formation rate and efficiency at ascale where local star formation is spatially resolved. Our CO map covers thecentral 2$\farcm$3 region of the galaxy; the combination of NRO45 and CARMAprovides a high fidelity image, enabling accurate measurements of molecular gassurface density. We find that star formation rate and efficiency are twice ashigh in the spiral arms as in the bar. We discuss this difference in thecontext of the Kennicutt-Schimidt (KS) law, which indicates a constant starformation rate at a given gas surface density. The KS law breaks down at ournative resolution ($\sim$ 250 pc), and substantial smoothing (to 500 pc) isnecessary to reproduce the KS law, although with greater scatter.

Star formation efficiency in the Barred Spiral Galaxy NGC 4303