Host Galaxy Morphology and the AGN Unified Model

Details Host Galaxy Morphology and the AGN Unified Model Host Galaxy Morphology and the AGN Unified Model

2011-12-16

arxiv.org/abs/1112.3970v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Conference Proceedings for Galaxy Mergers in an Evolving Universe (Hualien, Taiwan); Editors: Wei-Hsin Sun, Nick Scoville. 4 p

Scientific paper

We use a sample of active galaxies from the Cosmic Evolution Survey to show that host galaxy morphology is tied to the accretion rate and X-ray obscuration of its active galactic nucleus (AGN). Unobscured and rapidly accreting broad-line AGNs are more likely to be in spheroid-dominated hosts than weak or obscured AGNs, and obscured AGNs are more likely to have disturbed host galaxies. Much of the disagreement in previous work on the AGN-merger connection is likely due to each study probing AGNs with different obscuration and accretion properties. Only obscured AGNs seem to merger-driven, while weak AGNs are fed by stochastic processes in disks, and rapidly-accreting broad-line AGNs require massive bulges. Our observed "unified model" for AGN hosts fits with theoretical models for merger-driven AGN evolution, but is also consistent with steady-state AGN activity.

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