Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-04
Astronomy and Astrophysics
Astrophysics
Submitted to ApJL
Scientific paper
We have analyzed the frequency and properties of the nuclear activity in a sample of galaxies with circumnuclear rings and spirals (CNRs). This sample was compared with a control sample of galaxies with very similar global properties but without circumnuclear rings. We discuss the relevance of the results in regard to the AGN feeding processes and present the following results: (i) bright companion galaxies seem not to be important for the appearance of CNRs, which appear to be more related to intrinsic properties of the host galaxies or to minor merger processes; (ii) the proportion of strong bars in galaxies with an AGN and a CNR is somewhat higher than the expected ratio of strongly barred AGN galaxies from the results of Ho and coworkers; (iii) the incidence of Seyfert activity coeval with CNRs is clearly larger than the rate expected from the morphological distribution of the host galaxies; (iv) the rate of Sy 2 to Sy 1 type galaxies with CNRs is about three times larger than the expected ratio for galaxies without CNRs and is opposite to that predicted by the geometric paradigm of the classical unified model for AGNs, although it does support the hypothesis that Sy 2 activity is linked to circumnuclear star formation.
Aguero Maria P.
Diaz Ruben J.
Dottori Horacio
No associations
LandOfFree
Nuclear vs. Circumnuclear Activity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nuclear vs. Circumnuclear Activity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear vs. Circumnuclear Activity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-584416