The image was created from Hubble data from proposal 11563: G. Illingworth (UCO/Lick Observatory and the University of California, Santa Cruz), R. Bouwens (UCO/Lick Observatory and Leiden University), M. Carollo (Swiss Federal Institute of Technology, Zurich), M. Franx (Leiden University), I. Labbe (Carnegie Institution of Washington), D. Magee (University of California, Santa Cruz), P. Oesch (Swiss Federal Institute of Technology, Zurich), M. Stiavelli (STScI), M. Trenti (University of Colorado, Boulder), and P. van Dokkum (Yale University).
The image is a composite of separate exposures made by the WFC3 instrument on the Hubble Space Telescope. Three filters were used to sample broad wavelength ranges in the near infrared. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: