Circumnuclear stellar population, morphology and environment of seyfert 2 galaxies: an evolutionary scenario

摘要: We investigate the relation between characteristics of circumnuclear stellar population and both galaxy morphology presence close companions for a sample 35 Seyfert 2 nuclei. Fifteen galaxies present unambiguous signatures recent episodes star formation within ≈300 pc nucleus. When we relate this property to Hubble type host galaxy, find that incidence increases along sequence; it seems be greater than in non-Seyfert early types S0 Sa but similar later types. In early-type late-type galaxies, is related inner few kiloparsecs, as observed Space Telescope images through filter F606W by Malkan et al., who have assigned late "inner type" most with formation. This new classification due dust lanes spiral structures region. The around nuclei also interactions: among 13 or mergers, nine nuclear These correlations companions, morphology, suggest an evolutionary scenario which interaction responsible sending gas inward, feeds active galactic nucleus triggers starburst then fades time composite + evolves "pure" old population. can reconcile hypothesis triggered interactions results previous studies, only small excess interacting samples when compared samples. large found after interaction, phase (Seyfert+starburst) observed.