论文标题
HST和SDS中的星系自旋方向分布显示出相似的大尺度不对称性
Galaxy spin direction distribution in HST and SDSS show similar large-scale asymmetry
论文作者
论文摘要
最近使用大型星系数据集的几项观察结果表明，即使星系彼此距离太远而无法具有引力相互作用，螺旋星系的自旋方向的非随机分布。在这里，Hubble Space望远镜成像的$ \ sim8.7 \ cdot10^3 $螺旋星系用于测试和介绍星系旋转方向之间可能的不对称性。将具有相反自旋方向的星系之间的不对称性与斯隆数字天空调查的星系的不对称性进行了比较。这两个数据集在不同的红移范围内包含不同的星系，并且使用不同的注释方法对每个数据集进行注释。结果表明，两个数据集都在COSMOS字段中显示出类似的不对称性，这两个望远镜都涵盖了这两个望远镜。将星系的不对称拟合到余弦依赖性显示了偶极轴，其概率分别为$ \sim2.8σ$和$ \sim7.38σ$，分别为HST和SDSS。 HST星系中最有可能的偶极子轴为$（α= 78^o，δ= 47^o）$，与SDSS星系中最有可能的偶极子轴的位置相比，$ z> 0.15 $的位置在$1σ$误差范围之内，确定为$> 0.15 $（$（$）（$（α= 71 = 71^o，δ= 61 = 61^o）。
Several recent observations using large datasets of galaxies showed non-random distribution of the spin directions of spiral galaxies, even when the galaxies are too far from each other to have gravitational interaction. Here, a dataset of $\sim8.7\cdot10^3$ spiral galaxies imaged by Hubble Space Telescope is used to test and profile a possible asymmetry between galaxy spin directions. The asymmetry between galaxies with opposite spin directions is compared to the asymmetry of galaxies from the Sloan Digital Sky Survey. The two datasets contain different galaxies at different redshift ranges, and each dataset was annotated using a different annotation method. The results show that both datasets show a similar asymmetry in the COSMOS field, which is covered by both telescopes. Fitting the asymmetry of the galaxies to cosine dependence shows a dipole axis with probabilities of $\sim2.8σ$ and $\sim7.38σ$ in HST and SDSS, respectively. The most likely dipole axis identified in the HST galaxies is at $(α=78^o,δ=47^o)$, and is well within the $1σ$ error range compared to the location of the most likely dipole axis in the SDSS galaxies with $z>0.15$, identified at $(α=71^o,δ=61^o)$.
