AEGIS: A Panchromatic Study of IRAC-selected Extremely Red Objects with   Confirmed Spectroscopic Redshifts
  We study 87 Extremely Red Objects (EROs), selected both to have color redder than R-[3.6] = 4.0, and to have confirmed spectroscopic redshifts. Together, these two constraints result in this sample populating a fairly narrow redshift range at 0.76 < z < 1.42. The key new ingredient included here is deep Spitzer Space Telescope InfraRed Array Camera (IRAC) data. Based on [3.6]-[8.0] color, we demonstrate that it is possible to classify EROs into early-type, dusty starburst, or power-law (AGN) types. We present ultraviolet to mid-infrared spectral energy distributions (SEDs) and Advanced Camera for Surveys (ACS) images, both of which support our simple IRAC color classification. 
G. Wilson, J. S. Huang, G. G. Fazio, R. Yan, A. M. Koekemoer, S.   Salim, S. M. Faber, J. Lotz, C. N. A. Willmer, M. Davis, ...