Three-dimensional shape of a body of minimum drag in a hypersonic gas stream

Gusarov, Alexander; Левин, В. А.

doi:10.1007/bf01089717

Cited by 2 publications

(1 citation statement)

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“…This differs from the standard bullet TD formed by a moving source, which is typically regular and convex. The observed TD geometry is rather unexpected to form naturally in a steady flow, as convex regions typically generate additional shocks (e.g., Grishin & Pogorelov 1988;Chen & Feldman 2015, and references therein), instabilities (e.g., Morton 1996;Panaras & Drikakis 2011, and references therein), and drag (except in special cases; e.g., Gusarov & Levin 1982;Plakhov 2016). The evolving flow around the TD is not expected to be steady, especially not so close to nearest passage, but as we show below, gasdynamic effects including instabilities do not naturally explain the observed bullet morphology.…”

Section: Bullet Cluster: Protruding Headmentioning

confidence: 99%

Protruding bullet heads indicating dark matter pull

Keshet,

Raveh,

Naor

2021

Preprint

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A clump moving through the intracluster medium of a galaxy cluster can drive a bow shock trailed by a bullet-like core. In some cases, such as in the prototypical Bullet cluster, X-rays show a gas bullet with a protruding head and pronounced shoulders. We point out that these features, while difficult to explain without dark matter (DM), naturally arise as the head of the slowed-down gas is gravitationally pulled forward toward its unhindered DM counterpart. X-ray imaging thus provides a unique, robust probe of the offset, collisionless DM, even without gravitational lensing or other auxiliary data. Numerical simulations and a toy model suggest that the effect is common in major mergers, is often associated with a small bullet-head radius of curvature, and may lead to distinct bullet morphologies, consistent with observations.

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Section: Bullet Cluster: Protruding Headmentioning

confidence: 99%