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One Dark Matter Profile Please, Hold the Subhaloes

15 Jul 2020, 17:00 UTC
One Dark Matter Profile Please, Hold the Subhaloes
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Title: Illuminating Dark Matter Halo Density Profiles Without SubhaloesAuthors: Catherine E. Fielder, Yao-Yuan Mao, Andrew R. Zentner, Jeffrey A. Newman, Hao-Yi Wu, Risa WechslerFirst Author’s Institution: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USAStatus: Submitted to MNRAS
The History of a HaloEach of the galaxies inhabiting our universe lives in the center of a halo of dark matter. What that means is that a whole lot of matter we can see (including planets, stars, globular clusters, and light bulbs) all globbed together to make up a galaxy is surrounded by a whole lot of stuff we can’t see, called dark matter (DM). Despite its invisibility, the dark matter produces a gravitational pull both on other dark matter and “normal” matter. Consequently, the shape and structure of the dark matter in the galaxy’s halo are incredibly important to understand; they tell us not just how the halo interacts gravitationally, but also give us clues on how the galaxy got there in the first place. In fact, the dark matter halo forms first—there happens to be a little more dark matter in this particular corner of the universe, so it decides to get the band together and form ...

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