bamfai/galaxy-chirality-catalog

DESI Legacy星系手性目录（847万个星系）是一个天文学数据集，包含约847万个DESI Legacy星系的观测数据，专门用于分析星系自旋方向（手性）的宇宙学各向异性。该目录基于DESI Legacy Imaging Surveys的DR8数据，通过视觉变换器（ViT-Small）和等变技术（Z2-flip-equivariant）对星系进行分类，区分顺时针旋转（CW）、逆时针旋转（CCW）和非螺旋（NS）星系。数据集包含星系的坐标（赤经、赤纬）、星等（r波段）、红移（如果可用）、成像来源（BASS+MzLS、DECaLS、DES）、分类概率、轴向比、PSF椭圆度以及图像URL等字段。该数据集与一篇2026年的论文相关，论文探讨了通过单极-掩模泄漏通道解释星系手性偶极信号，并提供了宇宙学测量的结果，如偶极子显著性分析。数据集旨在支持天文学和宇宙学研究，特别是关于星系形态、自旋方向和宇宙学原理的测试。The DESI Legacy Galaxy Chirality Catalog (8.47M galaxies) is an astronomy dataset containing observational data for approximately 8.47 million DESI Legacy galaxies, specifically designed for analyzing cosmological anisotropy in galaxy spin directions (chirality). The catalog is based on DESI Legacy Imaging Surveys DR8 data and uses a Vision Transformer (ViT-Small) with equivariant techniques (Z2-flip-equivariant) to classify galaxies into clockwise (CW), counter-clockwise (CCW), and non-spiral (NS) categories. It includes fields such as celestial coordinates (RA, Dec), magnitude (r-band), redshift (if available), imaging source (BASS+MzLS, DECaLS, DES), classification probabilities, axial ratio, PSF ellipticity, and image URLs. The dataset is associated with a 2026 paper that investigates the explanation of galaxy chirality dipole signals through monopole-mask leakage channels and provides cosmological measurement results, such as dipole significance analysis. It aims to support astronomy and cosmology research, particularly in galaxy morphology, spin direction, and tests of the cosmological principle.