论文标题
银河系旋转方向的大规模不对称性 - DES，SDS和DESI传统调查中光谱的星系分析
Large-scale asymmetry in galaxy spin directions -- analysis of galaxies with spectra in DES, SDSS, and DESI Legacy Survey
论文作者
论文摘要
先前使用几种不同探针的多项研究表明，宇宙学尺度各向异性和哈勃尺度轴的存在证据。显示这种证据的探针之一是星系旋转方向的分布。与CMB各向异性相比，分析星系自旋方向分布的优势在于，星系自旋方向的比率是相对测量，因此对背景污染（例如银河系阻塞）的敏感性较小。另一个优点是许多螺旋星系具有光谱，因此可以分析此类轴相对于地球的位置。本文显示了超过90k星系与光谱的自旋方向的分布分析。该分析还与使用基于地球的SDSS，PAN-Starrs和Desi传统调查以及HST收集的空间数据进行比较。结果表明，与不同望远镜观察到的分布模式之间的一致性非常好。由星系的自旋方向形成的偶极子或四极轴不一定直接通过地球。
Multiple previous studies using several different probes have shown considerable evidence for the existence of cosmological-scale anisotropy and a Hubble-scale axis. One of the probes that show such evidence is the distribution of the directions toward which galaxies spin. The advantage of the analysis of the distribution of galaxy spin directions compared to the CMB anisotropy is that the ratio of galaxy spin directions is a relative measurement, and therefore less sensitive to background contamination such as Milky Way obstruction. Another advantage is that many spiral galaxies have spectra, and therefore allow to analyze the location of such axis relative to Earth. This paper shows an analysis of the distribution of the spin directions of over 90K galaxies with spectra. That analysis is also compared to previous analyses using the Earth-based SDSS, Pan-STARRS, and DESI Legacy Survey, as well as space-based data collected by HST. The results show very good agreement between the distribution patterns observed with the different telescopes. The dipole or quadrupole axes formed by the spin directions of the galaxies with spectra do not necessarily go directly through Earth.
