NGC 1275, Perseus A, 3C 84
The Hubble data are taken from the HST proposal 10546: A. Fabian and C. Crawford (Institute of Astronomy, University of Cambridge, UK), C. Conselice (University of Nottingham), and J. Gallager and E. Zweibel (University of Wisconsin, Madison).
F435W (B), F550W (V), and F625W (r)
These images are a composite of separate exposures made by the ACS instrument on the Hubble Space Telescope. Three filters were used to sample various broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
Blue: F435W (B)
Green: F550W (V)
Red: F625W (r)