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We present new maps of emission-line flux distributions and kinematics inboth ionized (traced by HI and [FeII] lines) and molecular (H2) gas of theinner 0.7x0.7kpc2 of the galaxy NGC4303, with a spatial resolution 40-80pc andvelocity resolution 90-150 km/s obtained from near-IR integral fieldspecroscopy using the VLT instrument SINFONI. The most promiment feature is a200-250pc ring of circum-nuclear star-forming regions. The emission fromionized and molecular gas shows distinct flux distributions: while thestrongest HI and [FeII] emission comes from regions in the west side of thering (ages~4Myr), the H2 emission is strongest at the nucleus and in the eastside of the ring (ages>10Myr). We find that regions of enhanced hot H2 emissionare anti-correlated with those of enhanced [FeII] and HI emission, which can beattributed to post starburst regions that do not have ionizing photons anymorebut still are hot enough (~2000K) to excite the H2 molecule. The line ratiosare consistent with the presence of an AGN at the nucleus.  The youngest regions have stellar masses in the range 0.3-1.5E5 MSun andionized and hot molecular gas masses of ~0.25-1.2E4 Msun and 2.5-5 Msun,respectively. The stellar and gas velocity fields show a rotation pattern, withthe gas presenting larger velocity amplitudes than the stars, with a deviationobserved for the H2 along the nuclear bar, where increased velocity dispersionis also observed, possibly associated with non circular motions along the bar.The stars in the ring show smaller velocity dispersion than the surroundings,that can be attributed to a cooler dynamics due to their recent formation fromcool gas.

A SINFONI view of the nuclear activity and circum-nuclear star formation in NGC 4303