Abell 2626 and friends: large and small scale structure
  New MMT/Hectospec spectroscopy centered on the galaxy cluster A2626 and
covering a ${\sim} 1.8\,\text{deg}^2$ area out to $z \sim 0.46$ more than
doubles the number of galaxy redshifts in this region. The spectra confirm four
clusters previously identified photometrically. A2625, which was previously
thought to be a close neighbor of A2626, is in fact much more distant. The new
data show six substructures associated with A2626 and five more associated with
A2637. There is also a highly collimated collection of galaxies and galaxy
groups between A2626 and A2637 having at least three and probably four
substructures. At larger scales, the A2626--A2637 complex is not connected to
the Pegasus--Perseus filament.
