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arXiv 0705.0647astro-ph
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SFI ++ II:一个新的I带Tully-Fisher星表,特征速度的推导和数据集性质

SFI++ II: A New I-band Tully-Fisher Catalog, Derivation of Peculiar Velocities and Dataset Properties

Christopher M. Springob, Karen L. Masters, Martha P. Haynes, Riccardo Giovanelli, Christian Marinoni

摘要:

我们提出的SFI++数据集,均匀派生的目录的光度和旋转性能和塔利-费舍尔距离和奇特的速度来自他们。我们利用数字光学图像,光学长缝光谱,和全球HI线配置文件,提取相关的磁盘缩放关系的参数,将几个以前公布的数据集,以及一个新的光度样本的约2000对象。根据天空区域内现有红移样本的完整性,我们利用改进的渗流算法和Voronoi-Delaunay方法将单个星系分配到星系团和星系团中,从而减少由局部轨道运动引起的散射。利用2 MASS红移巡天的密度场来近似大尺度结构,我们还对均匀和非均匀Malmquist偏差下的特殊速度进行了修正。我们总结了样本选择标准,对原始观测参数的修正,分组技术,以及我们推导特殊速度的过程。最终的SFI++4861个场星系和星系团星系的特殊速度表足够大,不仅可以研究大尺度流的全局统计,而且可以研究局部速度场的{ \it细节}。

英文摘要:

We present the SFI++ dataset, a homogeneously derived catalog of photometric and rotational properties and the Tully-Fisher distances and peculiar velocities derived from them. We make use of digital optical images, optical long-slit spectra, and global HI line profiles to extract parameters of relevance to disk scaling relations, incorporating several previously published datasets as well as a new photometric sample of some 2000 objects. According to the completeness of available redshift samples over the sky area, we exploit both a modified percolation algorithm and the Voronoi-Delaunay method to assign individual galaxies to groups as well as clusters, thereby reducing scatter introduced by local orbital motions. We also provide corrections to the peculiar velocities for both homogeneous and inhomogeneous Malmquist bias, making use of the 2MASS Redshift Survey density field to approximate large scale structure. We summarize the sample selection criteria, corrections made to raw observational parameters, the grouping techniques, and our procedure for deriving peculiar velocities. The final SFI++ peculiar velocity catalog of 4861 field and cluster galaxies is large enough to permit the study not just of the global statistics of large scale flows but also of the {\it details} of the local velocity field.

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