2007ApJ...654L...5K

Cosmic infrared background fluctuations may contain a measurable contribution from objects inaccessible to current telescopic studies, such as the first stars and other luminous objects in the first gigayear of the universe's evolution. In an attempt to uncover this contribution, we have analyzed the GOODS data obtained with the Spitzer Infrared Array Camera (IRAC). These data are deeper and cover larger scales than the Spitzer data that we have previously analyzed. Here we report these new measurements of the cosmic infrared background fluctuations remaining after removing cosmic sources to fainter levels than before. The remaining anisotropies on scales ∼0.5'-10' have a significant clustering component with a low shot-noise contribution. We show that these fluctuations cannot be accounted for by instrumental effects or by the solar system and Galactic foreground emissions and that they must arise from extragalactic sources.