Anatomy of active nuclei of galaxies: NGC1241 and M83.

Horacio Dottori¹
Diaz, Rubén²; Villamizar, N.³; Carranza, G.²; Lípari, S.

(1) IF/UFRGS (2) Observatorio Astronómico de Córdoba, Argentina (3) INAOE, México

GEMINI IR imagery and CIRPASS spectroscopy, HST IR narrow band imagery as well as spectroscopy with the 1.52 cm Córdoba refractor, reveals the inner structure of these nuclei at hundret of parsecs scales. NGC 1241 present a circumnuclear ring plus a inner300pc long bar, both emitting in Palpha. Fourier analysis shows a inner pattern speed of the order of 400km/sec/kpc, much larger than pattern velocities in the external disk. In M83 the double nucleus discovered spectroscopically with the Córdoba refractor, appears to be a collision of two small disks, as revealed by the 2-D spectroscopy carried out with CIRPASS.