A large population of mid-infrared-selected, obscured active galaxies in the boötes field

R. C. Hickox, C. Jones, W. R. Forman, S. S. Murray, M. Brodwin, M. J.I. Brown, P. R. Eisenhardt, D. Stern, C. S. Kochanek, D. Eisenstein, R. J. Cool, B. T. Jannuzi, A. Dey, K. Brand, V. Gorjian, N. Caldwell