标题： 新的银河系卫星：与VPOS的排列以及自行和速度弥散的预测 显示英文标题

标题： The new Milky Way satellites: alignment with the VPOS and predictions for proper motions and velocity dispersions

摘要： 银河系（MW）周围的恒星系统可能分布在巨大的极区结构（VPOS）中的证据可能会受到北半球巡天中检测到的卫星的观测偏差影响。 因此，最近在南半球发现的十几个新系统构成了对VPOS现象的关键测试。 我们报告说，新发现的天体位于原始VPOS附近，样本的一半偏移量小于20千秒差距。 新候选的矮卫星星系的位置如此一致，以至于修订后的最佳拟合VPOS结构的方向保留了9度以内，而VPOS的扁平化几乎保持不变（高度为31千秒差距）。 有趣的是，VPOS平面与银河系中心的最短距离现在仅为2.5千秒差距，表明新发现平衡了银河系中心的VPOS。 因此，大多数MW卫星与麦哲伦云共享相似的轨道平面，这证实了Kunkel和Demers以及Lynden-Bell近40年前提出的假设。 我们假设这些新天体在VPOS内运行，预测它们的绝对自行。 独立于VPOS的结果，我们还根据三种不同的假设预测了新系统的速度弥散：即它们（i）是没有暗物质的遵循牛顿动力学的星团，（ii）是位于暗物质晕中星系经验尺度关系上的矮卫星，以及（iii）遵循MOND理论。 显示英文摘要

摘要： The evidence that stellar systems surrounding the Milky Way (MW) are distributed in a Vast Polar Structure (VPOS) may be observationally biased by satellites detected in surveys of the northern sky. The recent discoveries of more than a dozen new systems in the southern hemisphere thus constitute a critical test of the VPOS phenomenon. We report that the new objects are located close to the original VPOS, with half of the sample having offsets less than 20 kpc. The positions of the new satellite galaxy candidates are so well aligned that the orientation of the revised best-fitting VPOS structure is preserved to within 9 degrees and the VPOS flattening is almost unchanged (31 kpc height). Interestingly, the shortest distance of the VPOS plane from the MW center is now only 2.5 kpc, indicating that the new discoveries balance out the VPOS at the Galactic center. The vast majority of the MW satellites are thus consistent with sharing a similar orbital plane as the Magellanic Clouds, confirming a hypothesis proposed by Kunkel & Demers and Lynden-Bell almost 40 years ago. We predict the absolute proper motions of the new objects assuming they orbit within the VPOS. Independent of the VPOS results we also predict the velocity dispersions of the new systems under three distinct assumptions: that they (i) are dark-matter-free star clusters obeying Newtonian dynamics, (ii) are dwarf satellites lying on empirical scaling relations of galaxies in dark matter halos, and (iii) obey MOND.