论文标题
银河系的卫星飞机：与$λ$ CDM一致
The Milky Way's plane of satellites: consistent with $Λ$CDM
论文作者
论文摘要
“卫星问题的平面问题”描述了银河系在一个非常薄的平面上的11个最亮卫星星系的排列，可能由旋转支撑。这显然与标准宇宙学模型矛盾，其中，星系被分散支持的暗物质光环包围。在这里，我们表明卫星系统的特殊各向异性是强烈的取决于偏斜的径向分布，而较早的模拟未能繁殖，并结合了两个最遥远的卫星，Leo I和Leo II的近距离但短暂的结合。使用Gaia适当的运动，我们表明轨道极比对比以前报道的要普遍得多，并且揭示了卫星的平面是短暂的，而不是旋转支持。与新的模拟相比，在这种短寿命的平面很常见的情况下，我们发现银河系卫星与标准模型期望兼容。
The "plane of satellites problem" describes the arrangement of the Milky Way's 11 brightest satellite galaxies in a remarkably thin plane, possibly supported by rotation. This is in apparent contradiction to the standard cosmological model, wherein the Galaxy is surrounded by a dispersion-supported dark matter halo. Here, we show that the reported exceptional anisotropy of the satellite system is strongly contingent on a lopsided radial distribution, which earlier simulations have failed to reproduce, combined with the close but fleeting conjunction of the two most distant satellites, Leo I and Leo II. Using Gaia proper motions, we show that the orbital pole alignment is much more common than previously reported, and reveal the plane of satellites to be transient rather than rotationally supported. Comparing to new simulations, where such short-lived planes are common, we find the Milky Way satellites to be compatible with standard model expectations.
