2004/10/18 by A. Romano, A. Rifatto, Romano, A. +8
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0410414
Proceedings of the 6th Italian Conference on Active Galactic Nuclei, held in Volterra, 25-28 May 2004
arxiv created 2004/10/18 · openalex publication_date 2004/10/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Active galaxies are often associated with starbursts, which are possible sources of fuelling for the nuclear black holes. By means of optical (3500-7500 A) spectroscopic and narrow-band photometric data (Halpha+[NII]6548,6583 and [OIII]5007) it is possible to detect starburst features in active nuclei and to study the correlation with Seyfert type and the surrounding environment. Here we present evidences of young stellar populations (HI high order Balmer lines) and extended Halpha emission (indicative of HII regions) in 6 nearby Seyfert galaxies (z < 0.02). These very preliminary results seem to suggest that the nuclear starburst presence does not depend on the Seyfert type, favouring the hypothesis of the AGN Unified Model. By estimating the present SFR (< 106 years) and recent SFR (< 109 years) we observe that these objects have experienced most of star formation episodes in past epochs. This supports the hypothesis of a starburst-AGN connection, favouring an evolutionary scenario in which the AGN survives to the starburst.