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Kamikaze galaxy explodes after diving into the Milky Way

作者:梁葫    发布时间:2019-03-05 06:10:03    

DON’T mess with the Milky Way. The Hercules dwarf galaxy has learned this the hard way: its stars are unusually spread out, probably the result of a close brush with our galaxy. Andreas Küpper at Columbia University in New York and his colleagues deduced the Hercules galaxy’s path through space and simulated how it got there. They found that as it neared the Milky Way half a billion years ago, material from our galaxy invaded it, pulling its stars and dark matter toward its centre. Then, as the dwarf galaxy skirted away from the Milky Way’s centre, its stars and dark matter rebounded, causing Hercules to “explode” into its current distended state (arXiv.org/abs/1608.05085). Today, Hercules’s stars owe allegiance more to the Milky Way than to each other:

 

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