Jan. 9, 2014 — An international team of astronomers has discovered a surprising new class of "hypervelocity stars" -- solitary stars moving fast enough to escape the gravitational grasp of the Milky Way galaxy.
"These new hypervelocity stars are very different from the ones that have been discovered previously," said Vanderbilt University graduate student Lauren Palladino, lead author on the study. "The original hypervelocity stars are large blue stars and appear to have originated from the galactic center. Our new stars are relatively small -- about the size of the sun -- and the surprising part is that none of them appear to come from the galactic core."
"It's very hard to kick a star out of the galaxy," said Holley-Bockelmann. "The most commonly accepted mechanism for doing so involves interacting with the supermassive black hole at the galactic core. That means when you trace the star back to its birthplace, it comes from the center of our galaxy. None of these hypervelocity stars come from the center, which implies that there is an unexpected new class of hypervelocity star, one with a different ejection mechanism."
This might be good evidence in support of the Dark Matter. Dark Matter interacts gravitationally, and those stars might have come close to some massive concentrations of it.
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It is also true that the outer parts of our galactic disc spins more quickly than the inner parts (i.e., opposite of how a whirlpool rotates on Earth, where the faster rotation of a whirlpool is near the center). This is also thought to possibly be caused by a dark matter halo around the perimeter of the galaxy.
That is backwards it is spinning faster at the center...Actually a little more complicated then that...edit on 10-1-2014 by abeverage because: (no reason given)
That is backwards it is spinning faster at the center...Actually a little more complicated then that...