干旱区生态环境知识资源中心

We present a study of the stars and ionised gas in the central kpc of the Seyfert 2 galaxy NGC 1358, using three-dimensional imaging spectroscopy obtained with OASIS (CFHT). We have derived both stellar and gaseous kinematical maps, including higher order Gauss-Hermite stellar velocity moments. Emission line (H alpha, H beta, [OIII], [NII]) and emission line ratios ([OIII]/H beta and [SII]/H alpha) maps have also been derived. These data reveal an inner gaseous spiral structure (size < 1 kpc) which clearly shows up as a perturbation in the ionised gas kinematic maps, but is not; seen in the stellar velocity maps. The presence of an inner bar could explain this feature. Simple dynamical models are built to constrain the mass-to-light ratio of the galaxy and the properties of the presumed inner bar.