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Accretion onto black holes at rates above the Eddington limit has long beendiscussed in the context of supermassive black hole (SMBH) formation andevolution, providing a possible explanation for the presence of massive quasarsat high redshifts (z$\gtrsim$7), as well as having implications for SMBH growthat later epochs. However, it is currently unclear whether such`super-Eddington' accretion occurs in SMBHs at all, how common it is, orwhether every SMBH may experience it. In this work, we investigate theobservational consequences of a simplistic model for super-Eddington accretionflows -- an optically thick, geometrically thin accretion disc (AD) where theinner-most parts experience severe photon-trapping, which is enhanced withincreased accretion rate. The resulting spectral energy distributions (SEDs)show a dramatic lack of rest-frame UV, or even optical, photons. Using a gridof model SEDs spanning a wide range in parameter space (including SMBH mass andaccretion rate), we find that large optical quasar surveys (such as SDSS) maybe missing most of these luminous systems. We then propose a set of colourselection criteria across optical and infra-red colour spaces designed toselect super-Eddington SEDs in both wide-field surveys (e.g., using SDSS, 2MASSand WISE) and deep & narrow-field surveys (e.g., COSMOS). The proposedselection criteria are a necessary first step in establishing the relevance ofadvection-affected super-Eddington accretion onto SMBHs at early cosmic epochs.

Searching for Super-Eddington Quasars using a Photon Trapping Accretion Disc Model