Circumnuclear star-forming regions in early type spiral galaxies

GUILLERMO F. HÄGELE, ÁNGELES I. DÍAZ, MÓNICA V. CARDACI, ELENA TERLEVICH, ROBERTO TERLEVICH Y GUILLERMO L. BOSCH

Viena

Congreso; Why Galaxies Care About AGB Stars II: Shining Examples and Common Inhabitants; 2010

Sociedad Austriaca de Astronomía y el Departamento de Astronomía de la Universidad de Viena

We discuss measurements, from high dispersion spectra, of gas and stellar velocity dispersions in 17 circumnuclear star-forming regions (CNSFRs) and the nuclei of three barred spiral galaxies: NGC 2903 (Hägele et al. 2009), NGC 3310 (Hägele et al. 2010) and NGC 3351 (Hägele et al. 2007). The stellar dispersions have been obtained fromthe Ca II triplet (CaT) lines at 8494, 8542, 8662 Å that originate in the atmospheres of red giant and supergiant stars belonging to the underlying stellar population of the clusters, while the gas velocity dispersions have been measured by Gaussian fits to the Hbeta 4861Å and [OIII] 5007Å lines.