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The Wide-field Infrared Survey Explorer (WISE) is an extremely capable andefficient black hole finder. We present a simple mid-infrared color criterion,W1-W2 \geq 0.8 (i.e., [3.4]-[4.6] \geq 0.8, Vega), which identifies 61.9 \pm5.4 AGN candidates per deg2 to a depth of W2 = 15.0. This implies a much largercensus of luminous AGN than found by typical wide-area surveys, attributable tothe fact that mid-infrared selection identifies both unobscured (type 1) andobscured (type 2) AGN. Optical and soft X-ray surveys alone are highly biasedtowards only unobscured AGN, while this simple WISE selection likely identifieseven heavily obscured, Compton-thick AGN. Using deep, public data in the COSMOSfield, we explore the properties of WISE-selected AGN candidates. At themid-infrared depth considered, 160 uJy at 4.6 microns, this simple criterionidentifies 78% of Spitzer mid-infrared AGN candidates according to the criteriaof Stern et al. (2005) and the reliability is 95%. We explore the demographics,multiwavelength properties and redshift distribution of WISE-selected AGNcandidates in the COSMOS field.

Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS