Arp 273, UGC 1810
The image was created from Hubble data from proposal 12326: K. Noll (PI), Z. Levay, M. Mutchler, T. Borders, L. Frattare, M. Livio, C. Christian, and H. Bond (Hubble Heritage Team/STScI).
F390W (U), F475X (g), and F600LP (Red Longpass)
This image is a composite of separate exposures acquired by the WFC3 instrument on HST. Several filters were used to sample broad 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:
Blue: F390W (U)
Green: F475X (g)
Red: F600LP (Red Longpass)