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Activity at the centers of galaxies, during which the central supermassiveblack hole is accreting material, is nowadays accepted to be rather ubiquitousand most probably a phase of every galaxy's evolution. It has been suggestedthat galactic mergers and interactions may be the culprits behind thetriggering of nuclear activity. We use near-infrared data from the new InfraredMedium-Deep Survey (IMS) and the Deep eXtragalactic Survey (DXS) of theVIMOS-SA22 field and radio data at 1.4 GHz from the FIRST survey and a deep VLAsurvey to study the environments of radio-AGN over an area of ~25 sq. degreesand down to a radio flux limit of 0.1 mJy and a J-band magnitude of 23 mag AB.Radio-AGN are predominantly found in environments similar to those of controlgalaxies at similar redshift, J-band magnitude, and U-R rest-frame absolutecolor. However, a sub-population of radio-AGN is found in environments up to100 times denser than their control sources. We thus preclude merging as thedominant triggering mechanism of radio-AGN. Through the fitting of thebroadband spectral energy distribution of radio-AGN in the least and most denseenvironments, we find that those in the least dense environments show higherradio-loudness, higher star formation efficiencies, and higher accretion rates,typical of the so-called high-excitation radio-AGN. These differences tend todisappear at z>1. We interpret our results in terms of a different triggeringmechanism for these sources that is driven by mass-loss through winds of youngstars created during the observed ongoing star formation.

The Infrared Medium-Deep Survey II: How to Trigger Radio-AGN? Hints from Their Environments