The SEDs, Host Galaxies and Environments of Variability Selected AGN in GOODS-S
Carolin Villforth, Vicki Sarajedini, Anton Koekemoer

TL;DR
This study demonstrates that variability selection is an effective method for identifying low-luminosity AGN and explores their host galaxies and environments, suggesting secular processes as likely triggers rather than major mergers.
Contribution
It provides a systematic analysis of variability-selected AGN in GOODS-S, highlighting their properties, host galaxy characteristics, and environmental factors, with insights into possible triggering mechanisms.
Findings
Variability selection reliably identifies low-luminosity AGN.
Most AGN hosts show disturbed morphologies and diverse star-formation levels.
Luminous AGN tend to avoid dense regions, while low-luminosity AGN are often near group centers.
Abstract
Variability selection has been proposed as a powerful tool for identifying both low-luminosity AGN and those with unusual SEDs. However, a systematic study of sources selected in such a way has been lacking. In this paper, we present the multi-wavelength properties of the variability selected AGN in GOODS South. We demonstrate that variability selection indeed reliably identifies AGN, predominantly of low luminosity. We find contamination from stars as well as a very small sample of sources that show no sign of AGN activity, their number is consistent with the expected false positive rate. We also study the host galaxies and environments of the AGN in the sample. Disturbed host morphologies are relatively common. The host galaxies span a wide range in the level of ongoing star-formation. However, massive star-bursts are only present in the hosts of the most luminous AGN in the sample.…
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