Detailed Information

Do bars trigger activity in galactic nuclei?

Cited 49 time in Web of Science Cited 51 time in Scopus

Lee, Gwang-Ho; Woo, Jong-Hak; Lee, Myung Gyoon; Hwang, Ho Seong; Lee, Jong Chul; Sohn, Jubee; Lee, Jong Hwan

Issue Date
University of Chicago Press
Astrophysical Journal, Vol.750 No.2, p. 141
We investigate the connection between the presence of bars and active galactic nucleus (AGN) activity, using a volume-limited sample of similar to 9000 late-type galaxies with axis ratio b/a > 0.6 and M-r < -19.5 + 5 log h at low redshift (0.02 <= z less than or similar to 0.055), selected from Sloan Digital Sky Survey Data Release 7. We find that the bar fraction in AGN-host galaxies (42.6%) is similar to 2.5 times higher than in non-AGN galaxies (15.6%), and that the AGN fraction is a factor of two higher in strong-barred galaxies (34.5%) than in non-barred galaxies (15.0%). However, these trends are simply caused by the fact that AGN-host galaxies are on average more massive and redder than non-AGN galaxies because the fraction of strong-barred galaxies (f(SB)) increases with u - r color and stellar velocity dispersion. When u - r color and velocity dispersion (or stellar mass) are fixed, both the excess of f(SB) in AGN-host galaxies and the enhanced AGN fraction in strong-barred galaxies disappears. Among AGN-host galaxies we find no strong difference of the Eddington ratio distributions between barred and non-barred systems. These results indicate that AGN activity is not dominated by the presence of bars, and that AGN power is not enhanced by bars. In conclusion, we do not find clear evidence that bars trigger AGN activity.
Files in This Item:
There are no files associated with this item.
Appears in Collections:

Related Researcher

  • College of Natural Sciences
  • Department of Physics and Astronomy
Research Area Compact Groups of Galaxies, HectoMAP, Velocity Dispersion Function


Item View & Download Count

  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.