arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.02963astro-ph.GA
收藏

旋涡星系自旋方向大尺度分布中的多极排列

Multipole alignment in the large-scale distribution of spin direction of spiral galaxies

Lior Shamir

摘要:

以前的观测表明,在远大于超星系团大小的尺度上,星系的自旋方向是非随机分布的。本文利用SDSS的$\sim1.7\cdot10^5$螺旋星系和Pan-STARRS的$3.3\cdot10^4$螺旋星系,分析了从地球观测到的螺旋星系的星系自旋分布。分析表明,在SDSS和Pan-STARRS中,星系自旋方向的分布形成了一种非随机的模式,并且可以以比纯粹的机会高得多的概率拟合到偶极轴。这些观测结果与之前的发现一致,但基于更多的数据和两个不同的望远镜。分析还表明,星系自旋方向的分布符合大尺度多极排列,最适合四极排列,概率为$\sim6.9σ$偶然具有这样的分布。比较来自SDSS和Pan-STARRS的两个独立的数据集,使得两个数据集中的星系具有相似的红移分布,提供了几乎相同的四极模式。

英文摘要:

Previous observations have suggested non-random distribution of spin directions of galaxies at scales far larger than the size of a supercluster. Here I use $\sim1.7\cdot10^5$ spiral galaxies from SDSS and $3.3\cdot10^4$ spiral galaxies from Pan-STARRS to analyze the distribution of galaxy spin patterns of spiral galaxies as observed from Earth. The analysis shows in both SDSS and Pan-STARRS that the distribution of galaxy spin directions forms a non-random pattern, and can be fitted to a dipole axis in probability much higher than mere chance. These observations agree with previous findings, but are based on more data and two different telescopes. The analysis also shows that the distribution of galaxy spin directions fits a large-scale multipole alignment, with best fit to quadrupole alignment with probability of $\sim6.9σ$ to have such distribution by chance. Comparison of two separate datasets from SDSS and Pan-STARRS such that the galaxies in both datasets have similar redshift distribution provides nearly identical quadrupole patterns.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑