SFI++

SFI++数据集是由海军研究实验室等机构合作开发的，包含4861个场和星系团的光度和旋转特性目录，以及从这些特性中得出的Tully-Fisher距离和特殊速度。该数据集利用数字光学图像、光学长狭缝光谱和全局HI线轮廓来提取与磁盘缩放关系相关的参数，并整合了多个先前发布的数据集以及约2000个新光度样本。数据集通过修改的渗透算法和Voronoi-Delaunay方法将单个星系分配到组和星系团中，从而减少由局部轨道运动引起的散射。此外，还提供了对均匀和不均匀Malmquist偏差的修正，使用2MASS红移调查密度场来近似大尺度结构。SFI++数据集不仅适用于研究大尺度流动的全球统计特性，还适用于研究局部速度场的细节。

The SFI++ dataset was developed collaboratively by the Naval Research Laboratory and other partnering institutions. It contains catalogs of luminosity and rotational properties for 4861 astronomical fields and galaxy clusters, as well as Tully-Fisher distances and peculiar velocities derived from these properties. This dataset utilizes digital optical images, optical long-slit spectroscopy, and global HI line profiles to extract parameters related to disk scaling relations, and incorporates multiple previously published datasets along with approximately 2000 new luminosity samples. Individual galaxies are assigned to groups and galaxy clusters via a modified percolation algorithm and Voronoi-Delaunay method, thereby reducing scatter induced by local orbital motions. Additionally, corrections for both homogeneous and inhomogeneous Malmquist bias are provided, with the density field from the 2MASS Redshift Survey used to approximate large-scale structure. The SFI++ dataset is applicable not only to studies of the global statistical properties of large-scale flows, but also to investigations of the details of the local velocity field.