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- W3203262016 abstract "An overwhelming majority of galactic spiral arms trail with respect to the rotation of the galaxy, though a small sample of leading spiral arms has been observed. The formation of these leading spirals is not well understood. Here we show, using collisionless $N$-body simulations, that a barred disc galaxy in a retrograde dark matter halo can produce long-lived ($sim3$ Gyr) leading spiral arms. Due to the strong resonant coupling of the disc to the halo, the bar slows rapidly and spiral perturbations are forced ahead of the bar. We predict that such a system, if observed, will also host a dark matter wake oriented perpendicular to the stellar bar. More generally, we propose that any mechanism that rapidly decelerates the stellar bar will allow leading spiral arms to flourish." @default.
- W3203262016 created "2021-10-11" @default.
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- W3203262016 date "2021-10-08" @default.
- W3203262016 modified "2023-10-16" @default.
- W3203262016 title "Bar-driven leading spiral arms in a counter-rotating dark matter halo" @default.
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- W3203262016 doi "https://doi.org/10.1093/mnras/stab2904" @default.
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