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A large fraction of active galactic nuclei (AGN) are "invisible" in extantoptical surveys due to either distance or dust-obscuration. The existence ofthis large population of dust-obscured, infrared-bright AGN is predicted bymodels of galaxy - supermassive black hole coevolution and is required toexplain the observed X-ray and infrared backgrounds. Recently, infraredcolour-cuts with WISE have identified a portion of this missing population.However, as the host galaxy brightness relative to that of the AGN increases,it becomes increasingly difficult to differentiate between infrared emissionoriginating from the AGN and from its host galaxy. As a solution, we havedeveloped a new method to select obscured AGN using their 20 cm continuumemission to identify the objects as AGN. We created the resulting Invisible AGNCatalogue by selecting objects that are detected in AllWISE (mid-IR) and FIRST(20 cm), but are not detected in SDSS (optical) or 2MASS (near-IR), producing afinal catalogue of 46,258 objects. 30 per cent of the objects are selected byexisting selection methods, while the remaining 70 per cent represent apotential previously-unidentified population of candidate AGN that are missedby mid-infrared colour cuts. Additionally, by relying on a radio continuumdetection, this technique is efficient at detecting radio-loud AGN at z > 0.29,regardless of their level of dust obscuration or their host galaxy's relativebrightness.

The Invisible AGN Catalogue: A Mid-Infrared - Radio Selection Method for Optically-Faint Active Galactic Nuclei