Post-starburst-active galactic nucleus connection: spatially resolved spectroscopy of H delta-strong active galactic nuclei

作者：Goto T^*

来源：Monthly Notices of the Royal Astronomical Society, 2006, 369(4): 1765-1772.

DOI：10.1111/j.1365-2966.2006.10413.x

• galaxies : active
• galaxies : evolution
• galaxies : nuclei
• galaxies : Seyfert
• galaxies : starburst
• galaxies : structure

Ever since the coexistence of an active galactic nucleus (AGN) and a starburst was observationally discovered, there has been a significant controversy over whether there is a physical connection between starbursts and AGN. If yes, it is a subject of interest to reveal which one triggers another. Here, we bring a unique insight into the subject by identifying 840 galaxies with both a post-starburst signature (strong Balmer absorption lines) and an AGN (based on the emission-line ratio). These post-starburst AGN account for the 4.2 per cent of all the galaxies in a volume-limited sample. The presence of a post-starburst phase with an active AGN itself is of importance, suggesting that AGN may outlive starbursts in the starburst-AGN connection. In addition, we have performed spatially resolved spectroscopy of three of our post-starbusrst AGN galaxies, obtaining some evidence that the post-starburst region is more extended, but sharply centred around the central AGN, confirming a spatial connection between the post-starburst and AGN.

• 出版日期2006-7-11