Near-infrared observations of star formation and gas flows in the NUGA galaxy NGC 1365

In the framework of understanding the gas and stellar kinematics and their relations to AGNs and galaxy evolution scenarios, we present spatially resolved distributions and kinematics of the stars and gas in the central similar to 800 pc radius of the nearby Seyfert galaxy NGC 1365. We obtained H + K- and K-band near-infrared (NIR) integral-field observations from VLT/SINFONI. Our results reveal strong broad and narrow emission-line components of ionized gas (hydrogen recombination lines Pa alpha and Br gamma) in the nuclear region, as well as hot dust with a temperature of similar to 1300 K, both typical for type-1 AGNs. From M-BH - sigma(*) and the broad components of hydrogen recombination lines, we find a black-hole mass of (5-10) x 10(6) M-circle dot. In the central similar to 800 pc, we find a hot molecular gas mass of similar to 615 M-circle dot, which corresponds to a cold molecular gas reservoir of (2-8) x 10(8) M-circle dot. However, there is a molecular gas deficiency in the nuclear region. The gas and stellar-velocity maps both show rotation patterns consistent with the large-scale rotation of the galaxy. However, the gaseous and stellar kinematics show deviations from pure disk rotation, which suggest streaming motions in the central <200 pc and a velocity twist at the location of the ring which indicates deviations in disk and ring rotation velocities in accordance with published CO kinematics. We detect a blueshifted emission line split in Pa alpha, associated with the nuclear region only. We investigate the star-formation properties of the hot spots in the circumnuclear ring which have starburst ages of less than or similar to 10 Myr and find indications for an age gradient on the western side of the ring. In addition, our high-resolution data reveal further substructure within this ring which also shows enhanced star forming activity close to the nucleus.