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首页> 外文期刊>The Astrophysical journal >Dark Matter Deficient Galaxies Produced via High-velocity Galaxy Collisions in High-resolution Numerical Simulations
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Dark Matter Deficient Galaxies Produced via High-velocity Galaxy Collisions in High-resolution Numerical Simulations

机译：暗物质缺乏通过高速星系碰撞产生的高分辨率数值模拟产生的星系

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The recent discovery of diffuse dwarf galaxies that are deficient in dark matter appears to challenge the current paradigm of structure formation in our universe. We describe numerical experiments to determine if so-called dark matter deficient galaxies (DMDGs) could be produced when two gas-rich, dwarf-sized galaxies collide with a high relative velocity of ～300 km s~(?1). Using idealized high-resolution simulations with both mesh-based and particle-based gravito-hydrodynamics codes, we find that DMDGs can form as high-velocity galaxy collisions and separate dark matter from the warm disk gas, which subsequently is compressed by shock and tidal interaction to form stars. Then using the large simulated universe IllustrisTNG, we discover a number of high-velocity galaxy collision events in which DMDGs are expected to form. However, we did not find evidence that these types of collisions actually produced DMDGs in the TNG100-1 run. We argue that the resolution of the numerical experiment is critical to realizing the "collision-induced" DMDG formation scenario. Our results demonstrate one of many routes in which galaxies could form with unconventional dark matter fractions.
机译：最近发现缺陷暗物质的漫射矮星系的发现似乎挑战了我们宇宙中结构形成的当前范式。我们描述了在两种气体的矮小大小的星系与〜300km S〜（α1）的高相对速度碰撞时产生的数值实验，以确定是否所谓的暗物质缺陷的星系（DMDG）。使用具有基于网格和基于粒子的Gravito-流体动力学码的理想化高分辨率模拟，我们发现DMDG可以形成为高速星系碰撞，并从温暖的磁盘气体中分离暗物质，随后被休克和潮汐压缩形成星星的互动。然后使用大型模拟宇宙IllustriStnist，我们发现许多高速星系碰撞事件，预期DMDGS将形成。但是，我们没有发现这些类型的碰撞实际上在TNG100-1运行中产生了DMDG。我们认为数值实验的分辨率对于实现“碰撞诱导的”DMDG形成情况至关重要。我们的结果展示了许多航线之一，其中星系可以与非传统的暗物质分数形成。

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