Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..421..115d&link_type=abstract
Galaxies in Isolation: Exploring Nature Versus Nurture, proceedings of a conference held 12 to 15 May 2009 in Granada, Spain. Ed
Other
1
Scientific paper
We review the biases which have led to contradictory results on the effects of interactions in triggering nuclear activity in galaxies. We can now neatly show that Sy2s are in close ( < 100kpc ) physical interaction with the same frequency as most starburst (SB) galaxies, and this frequency is significantly higher than the one for Sy1s which in turn, is similar to the one for “normal” (non-active) galaxies. Next, we present results from a complementary approach: the analysis of the incidence of activity in close pairs. For this we carried out observations for a well defined sample of interacting galaxies: The isolated mixed morphology ( E + S ) pairs. One result indicates that AGN activity tends to appear in pairs of galaxies which are physically closer to one another. A striking result is that only one, out of 39 clear-cut AGN in our sample, is of type 1. This frequency of type 1 activity is too low to be explained with an obscuration/orientation effect alone. We discuss an alternative -though inclusive- model to the so called “Unified Model”.
Dultzin Deborah
Gonzalez Jesús J.
Hernández-Toledo Hector
Krongold Yair
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