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    Lopsided Galaxies Shed Light on the Speed of Dark Matter

    January 30, 2024, Categories  Astronomy/Space

    Lopsided galaxies shed light on the speed of dark matter
    Fig. 1. Dynamical friction. The panels depict sparse areas of the universe with dark color and dense areas with light color. The upper panels show the density around a galaxy if the galaxy’s gravity bends (left) or does not bend (right) the trajectories of dark matter particles. The lower panel shows the difference between them, or how the galaxy affects the distribution of dark matter. The arrows represent the acceleration caused by the overdensity behind the galaxy, from which the friction on the center of the galaxy is deducted. Since the arrows have different directions and strengths in different areas, the tidal forces are able to change the shape of a galaxy. Credit: Rain Kipper

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