1999/05/27 by Yoshiaki Taniguchi · 1 citation
Physics and Astronomy · #Accretion (finance) #Active galactic nucleus #Astronomy and Astrophysical Research #Black hole (networking) #Galactic nuclei #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy merger #Gamma-ray bursts and supernovae #Gravitation #Quasar #Supermassive black hole #astro-ph
paper · pdf · doi:10.1086/307814
7 pages, 1 figure. The Astrophysical Journal, Part 1, in press
arxiv created 1999/05/27 · openalex publication_date 1999/10/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Seyfert nuclei are typical active galactic nuclei (AGNs) in the local universe, which are thought to be powered by gas accretion onto a supermassive black hole (SMBH). The dynamical effect exerted either by non-axisymmetric gravitational potential (such as a stellar bar) or by interaction with other galaxies has been often considered to cause the efficient gas fueling. However, recent systematic studies for large samples of Seyfert nuclei have shown that; 1) Seyfert nuclei do not prefer barred galaxies as their hosts, and 2) only ≃ 10% of Seyfert galaxies have companion galaxies. These findings raise again a question; "What is important in the fueling of nuclear activity ?" Here we suggest that an alternative fueling mechanism, the minor-merger (i.e., mergers between a gas-rich disk galaxy and a bound, less-massive satellite galaxy) driven fueling appears consistent with almost all important observational properties of Seyfert galaxies. Nucleated (i.e., either a SMBH or a dense nuclear star cluster) galaxies and satellites seem necessary to ensure that the gas in the host disk is surely fueled into the very inner region (e.g., ≪ 1 pc). Taking account that local quasars may be formed by major mergers between/among galaxies, we propose that all the AGNs in the local universe were made either by minor or by major mergers.