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Activity induced by Gravitational Interaction in Galaxy Pairs

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arxiv 0809.1680 v1 pith:PVITCPET submitted 2008-09-09 astro-ph

Activity induced by Gravitational Interaction in Galaxy Pairs

classification astro-ph
keywords activitypairseffectsevolutionaryfoundgalaxiesgalaxynuclear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A systematic study of the nuclear emission of a sample of 97 spirals in isolated galaxy pairs with mixed morphology (E+S) shows that: 1) AGN activity is found in 40% of the spiral galaxies in these pairs, 2) Only one out of the 39 AGN found has type 1 (Broad line Component) activity, and 3) AGN tend to have closer companions than star forming galaxies. These results are at odds with a simple Unified Model for Seyferts, where only obscuration/orientation effects are of relevance, and neatly support an evolutionary scenario where interactions trigger nuclear activity, and obscuration/orientation effects may be complementary in a certain evolutionary phase.

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