The image was created from Hubble data from proposals 11015: J. Hughes, J. Warren, and L. Hovey (Rutgers University), C. Badenes (Weizmann Institute of Science, Israel), C. Smith (NOAO/CTIO), J. Vink (Space Research Organization, Netherlands), and P. Ghavamian (STScI); and 12326: K. Noll, Z. Levay, M. Livio, H. Bond, C. Christian, L. Frattare, M. Mutchler, and T. Borders (Hubble Heritage Team/STScI).
F475W (g), F555W (V), F658N (H-alpha+[N II]), and F814W (I)
This image is a composite of separate exposures acquired by the WFC3 and ACS instruments on HST. Several filters were used to sample broad and narrow wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:
Violet: F475W (g)
Green: F555W (V)
Orange: F814W (I)
Red: F658N (H-alpha+[N II])