Hickson Compact Group 90, HCG 90, M59
This image was created from HST data from proposal 10554: R. Sharples (University of Durham), M. Beasley (University of California, Santa Cruz), J. Blakeslee (Dominion Astrophysical Observatory), S. Zepf and A. Kundu (Michigan State University), and J. Cho (University of Durham).
F850LP (z) and F475W (g)
The image is a composite of separate exposures made by the ACS instrument on the Hubble Space Telescope. Two filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
Red: F850LP (z)
Green: F850LP (z) + F475W (g)
Blue: F475W (g)