New observations suggest those galaxies could be part of a string of similarly bizarre objects—the debris from a galactic smashup that may have occurred some eight billion years ago
, they found as many as 11 galaxies—including DF2 and DF4—in a row.
Bookending the trail are two galaxies that van Dokkum says could be the dark-matter-rich remnants of the original colliding galaxies, but confirming that will be a challenge because the galaxies are very faint and tough to observe in detail.Even though questions remain about this potential galactic pileup, some scientists think it’s a plausible explanation for how those dark-matter-deficient galaxies formed and grew.
“One of the big puzzles in these systems is that they seem to have these very overly massive star clusters, and why should that be?” Boylan-Kolchin says. “This galaxy-galaxy collision really gives you the mechanism to produce the extra set of more massive clusters.”“It’s all the beginning of a great mystery, in a way,” says the University of Surrey’s, who studies galaxy formation.
“There’s just not enough data at all to rule out that these galaxies aren’t a constellation that we’re seeing,” she says. “It’s tempting to ascribe meaning to patterns.”
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