Hi. Abell2667 was imaged by Rolf a while ago, so decided to have another look.
screen size:
http://www.astrobin.com/full/221268/0/
full res, resampled 140%:
http://www.astrobin.com/full/221268/0/?real=&mod=
The most amazing characteristic of this region is how many galaxies there are - maybe 3000 are visible as faint smudges (down to about Bmag25). Most are found in a sweeping arc from the top left to bottom right in the image, but they are also spread across the rest of the field at lower densities. An intriguing and highly red-shifted group is seen at the left of
http://www.astrobin.com/full/221267/0/ which is from the top left of the main image - these are a lonng way away.
There is a high mass concentration down and to the left of centre in the main image - this is the Abell2667 region imaged in one of the Hubble Frontier Fields. The image is lightened a bit and shown alongside Hubble data for easy interpretation:
http://www.astrobin.com/full/221266/0/. The main galaxies are redshifted by z=0.23, so the light has taken about 2.8 billion years to get here - and the UV light (now blue) is reduced by some stellar absorption bands, so most galaxies look yellow/orange. The big blue galaxy is radiating significant UV (now blue). It is being torn apart by gravity and pressure effects as it falls through the intra-cluster medium. Some of the galaxy scraps can be seen as a wake. The other main interest in the region is the huge gravitational arc, which is a magnified triple image of a far off galaxy situated well behind the main cluster. The gravity in the cluster is sufficient to form a lens (the equivalent of a refractor much bigger than the milky way) and this magnifies and condenses the background light. The arc has a red shift of z=1.03, which means that these ancient photons have been travelling for about 8 billion years. When they started out, the solar system did not exist and the universe has changed so much since that the UVA, UVB and UVC light from the arc galaxy is now (roughly) RGB - the colour actually looks like it does not quite belong in this universe come to think of it...
had great fun imaging and trying to understand more about this region - thanks for looking. regards ray
P.S. don't bother with the JPEG below - it doesn't show the whole region.