论文标题
DESI传统调查中星系的旋转方向分析
Analysis of spin directions of galaxies in the DESI Legacy Survey
论文作者
论文摘要
与其他基于地球的调查相比，DESI传统调查是一项数字天空调查，其占地面积大，涵盖了北半球和南半球。本文显示了DESI传统调查成像的螺旋星系的旋转方向的分布。简单地分析了将近1.3 $ \ cdot10^6 $螺旋星系为两个半球的螺旋星系表明，北半球逆时针旋转的星系较高，并且在南半球的顺时针旋转的星系较高。该分布与以前的观察结果一致，但使用了大量的星系和更大的足迹。较大的足迹允许进行全面的分析，而无需将分布融入先验模型，这使得该研究与此类先前的所有分析不同。将星系的旋转方向拟合到余弦依赖性显示偶极轴对齐，概率为$ p <10^{ - 5} $。分析是通过无数选择的星系选择，以及不利用任何形式的机器学习，深度学习或模式识别的简单解释注释算法。尽管需要进一步的工作，但这些结果与先前的研究保持一致，这表明存在大规模的星系角动量的可能性。
The DESI Legacy Survey is a digital sky survey with a large footprint compared to other Earth-based surveys, covering both the Northern and Southern hemispheres. This paper shows the distribution of the spin directions of spiral galaxies imaged by DESI Legacy Survey. A simple analysis of dividing nearly 1.3$\cdot10^6$ spiral galaxies into two hemispheres shows a higher number of galaxies spinning counterclockwise in the Northern hemisphere, and a higher number of galaxies spinning clockwise in the Southern hemisphere. That distribution is consistent with previous observations, but uses a far larger number of galaxies and a larger footprint. The larger footprint allows a comprehensive analysis without the need to fit the distribution into an a priori model, making this study different from all previous analyses of this kind. Fitting the spin directions of the galaxies to cosine dependence shows a dipole axis alignment with probability of $P<10^{-5}$. The analysis is done with a trivial selection of the galaxies, as well as simple explainable annotation algorithm that does not make use of any form of machine learning, deep learning, or pattern recognition. While further work will be required, these results are aligned with previous studies suggesting the possibility of a large-scale alignment of galaxy angular momentum.
