Kinematics of gas and stars in circumnuclear star-forming regions of early type spirals

G.F. HÄGELE, A.I. DÍAZ, M.V. CARDACI, E. TERLEVICH AND R. TERLEVICH

Universidad Europea de Madrid, Madrid, España

Workshop; II Workshop de ASTROCAM; 2007

Universidad Europea de Madrid

We present high spectral resolution (R 20000) observations in the blue and the far red of circumnuclear star-forming regions (CNSFRs) in several early type spirals which have allowed the study of the kinematics of stars and ionized gas in these structures and, for the first time, the derivation of their dynamical masses. In some cases these regions, about 100 to 150 pc in size, are seen to be composed of several individual star clusters with much smaller sizes. The measured values of the stellar velocity dispersions yield dynamical masses of the order of 10E07 solar masses for the whole CNSFRs.