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Juntai Shen

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A slightly oblate dark matter halo revealed by a retrograde precessing Galactic disk warp - Nature Astronomy

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By Yang Huang, Huawei Zhang, Jifeng Liu, Timothy C. Beers, Youjun Lu, Song Wang, Tigran Khachaturyants, Juntai Shen
| Nature Verified
Abstract The shape of the dark matter (DM) halo is key to understanding the hierarchical formation of the Galaxy. Despite extensive efforts in recent decades, however, its shape remains a matter of debate, with suggestions ranging from strongly oblate to prolate. Here, we present a new constraint on its present shape by directly measuring the evolution of the Galactic disk warp with time, as traced by accurate distance estimates and precise age determinations for about 2,600 classical Cepheids.
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