Instead of being dispersed evenly around the galaxy M81, a bunch of newfound dwarf galaxies stick to one side of that galaxy. Astronomers don’t know why.
— The faint dwarf galaxies in a nearby galaxy group seem to have missed the memo. Instead of being dispersed evenly around the group’s most massive galaxy, which is what happens in our own galaxy group, these newly found dwarfs cluster in one region. And astronomers don’t know why.
“This satellite distribution is just weird,” astronomer Eric Bell said June 13 at the American Astronomical Society meeting. Bell, of the University of Michigan in Ann Arbor, and colleagues used the Subaru telescope in Hawaii to hunt for faint clumps of stars, indicating dwarf galaxies, around the galaxy M81. This Milky Way–like galaxy is the most prominent member in a relatively nearby group of galaxies, all about 12 million light-years from Earth. The team found one definite dwarf galaxy and six possible fainter ones.
Most of the known satellite galaxies in the M81 galaxy group, along with seven newfound candidates , seem to cluster toward one side of the galaxy M81 .“The part that’s just bananas,” Bell said, is that the newfound satellite galaxies all sit on one side of M81. Computer simulations of galaxy evolution suggest that the largest galaxies have many faint, small galaxies sprinkled uniformly throughout the outer part of the dominant galaxy’s diffuse cloudlike halo. Observations in our galaxy group back this up: The
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