Mid-infrared properties and color selection for X-ray-detected active galactic nuclei in the MUSYC extended Chandra Deep Field-South

We present the mid-infrared colors of X-ray-detected AGNs and explore mid-infrared selection criteria. Using a statistical matching technique, the likelihood ratio, over 900 IRAC counterparts were identified with a new MUSYC X-ray source catalog that includes similar to 1000 published X-ray sources in the Chandra Deep Field-South and Extended Chandra Deep Field -South. Most X-ray-selected AGNs have IRAC spectral shapes consistent with power-law slopes, f(nu) proportional to nu(alpha), and display a wide range of colors, -2 <= alpha <= 2. Although X-ray sources typically fit to redder (more negative alpha) power laws than non-X-ray-detected galaxies, more than 50% do have flat or blue (galaxy-like) spectral shapes in the observed 3 -8 mu m band. Only a quarter of the X-ray-selected AGNs detected at 24 mu m are well fit by featureless red power laws in the observed 3.6 -24 mu m, likely the subset of our sample whose infrared spectra are dominated by emission from the central AGN region. Most IRAC color selection criteria fail to identify the majority of X-ray-selected AGNs, finding only the more luminous AGNs, the majority of which have broad emission lines. In deep surveys, these color selection criteria select 10% -20% of the entire galaxy population and miss many moderate-luminosity AGNs.