发表机构
Instituto de Astrofísica de Andalucía, CSIC（安达卢西亚天体物理研究所，西班牙科学理事会）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过73个银河系矮星系样本确定22个VPOS成员，新增6个成员，修订其结构参数，将已知VPOS成员数增加近50%。
AI 中文摘要
Vast Polar Structure（VPOS，巨大极向结构）是一个几乎垂直于银河系（MW）盘的矮星系薄平面结构。自发现以来，得益于对银河系附近新矮星系的持续发现以及对其相空间坐标日益精确的测量，VPOS成员星系的普查规模逐步扩大。本研究基于文献中拥有位置和运动学数据的73个银河系矮星系样本，给出了迄今为止最大规模的VPOS成员普查。基于它们的轨道极，我们确定了22个VPOS成员：12个银河系卫星、大麦哲伦云（LMC）以及9个LMC卫星。除牧夫座III、Kim 1和玉夫座外，所有平面上的矮星系均为同向旋转。我们的修订普查将已知VPOS成员数量增加了近50%，新增了Delve 4、Kim 1、Kim 3、波江座III、绘架座II和YMCA-1（分别为3个银河系卫星和3个LMC卫星）作为新的平面矮星系。基于此更新的普查，我们修订了VPOS的结构参数，确认其为平面结构（c/a≈0.27）且异常稀薄（约15千秒差距）。
英文摘要
The Vast Polar Structure (VPOS) is a thin, planar arrangement of dwarf galaxies oriented almost perpendicular to the Milky Way (MW) disc. Since its discovery, the census of VPOS member galaxies has progressively expanded thanks to continuous findings of new dwarfs in the vicinity of the MW and increasingly precise measurements of their phase-space coordinates. In this work, we present the largest census to date of VPOS member galaxies, building on a sample of 73 MW dwarfs for which positional and kinematic data are available in the literature. Based on their orbital poles, we identify 22 VPOS members: 12 MW satellites, the Large Magellanic Cloud (LMC), and 9 LMC satellites. With the exception of Bootes III, Kim 1, and Sculptor, all the on-plane dwarfs are co-rotating. Our revised census increases the known VPOS member population by nearly 50%, introducing Delve 4, Kim 1, Kim 3, Eridanus III, Pictor II, and YMCA-1 (3 MW and 3 LMC satellites, respectively) as new on-plane dwarfs. From this updated census, we revise the structural parameters of the VPOS, confirming its planar ($c/a \sim$0.27) and remarkably thin ($\sim$15 kpc) nature.
Comments6 pages, 1 figure, 2 tables, submitted to A&A
