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We have combined data from the NOAO Deep Wide-Field Survey in Bootes and theSpitzer Space Telescope to determine basic properties for sixteen optically"invisible" MIPS 24um (OIMS) and thirty-five optically "invisible" radio (OIRS)soruces, including their spectral energy distributions (SED) and luminosities.Most OIMSs possess steep power-law SEDs over lambda(rest) = 1-10 um, indicatingthe presence of obscured AGN in agreement with Spitzer spectroscopy. Theseobjects are extremely luminous at rest-frame near and mid-IR (nu L_nu(5um) ~10^{38}-10^{39} W), consistent with accretion near the Eddington limit andfurther implying that they host buried QSOs. The majority of the IRAC detectedOIRSs have flat 3.6 to 24um SEDs, implying comparable emission from stellarphotospheres and hot AGN illuminated dust. This may reflect relatively smallamounts of dust close to the central engine or current low mass accretionrates. A small subset of OIRSs appear to be starburst dominated withphotometric redshifts from 1.0 to 4.5. The OIMSs and OIRSs with significantstarburst components have similar L_K and stellar masses (M* ~ 10^{11} M_solar)assuming minimal AGN contribution. Roughly half of the OIRSs are not detectedby Spitzer's IRAC or MIPS. These are most likely z > 2 radio galaxies. The IRACdetected OIRSs are more likely than OIMSs to appear non point-like in the 3.6umand 4.5um images, suggesting that interactions play a role in triggering theiractivity. The AGN powered OIMSs may represent sub-millimeter galaxies makingthe transition from starburst to accretion dominance in their evolution tocurrent epoch massive ellipticals.

Radio and Infrared Selected Optically Invisible Sources in the Bo\"otes NDWFS