Science, Space and Technology News 2024
Researchers have measured the Milky Way’s warp precession with Cepheid stars, uncovering an oblate dark matter halo influencing the galaxy’s structural dynamics. Credit: Kaiyuan Hou and Zhanxun Dong from the Shanghai Jiao Tong University’s warp using Cepheid variable stars. Their findings suggest the Milky Way’s dark matter halo is slightly oblate, shaping our understanding of galactic dynamics and the structure of the universe.
Left panel: the spinning top precesses under the torque from gravity; Right panel: similar to the spinning top, the Galactic disk warp “dances gracefully” under the torque of the dark matter halo. Credit: Kaiyuan Hou and Zhanxun Dong from the Shanghai Jiao Tong UniversityBy “seeing” how the disk warp evolves with age, the researchers found that the warp precesses in a retrograde direction at a rate of 2 km/s/kpc .
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