2 MFGC和SFI ++样品中旋涡星系的距离和奇特速度
Distances and peculiar velocities of spiral galaxies in the 2MFGC and SFI++ samples
摘要：
我们比较了来自两个最大数据集的螺旋星系的红外Tully-Fisher（TF）距离和特殊速度：2 MASS选择的扁平星系目录，2 MFGC [19，20]和Arecibo通用目录与I波段测光，SFI++ [30，7]。这些样本分别包含约3000和约4000个物体的特殊速度。基于约1000个常见的深倾斜星系的子样本，我们得出以下结论。无论高（SFI++）或低（2 MFGC）质量的光度数据，约10%的星系在这两个样本中的TF关系的主体偏离很大。删除后，标准TF散射下降到0.47 μ m（2 MFGC）和0.40 μ m（SFI++）。由两个样品得到的TF距离显示出高度的相互一致性，相关系数\ro =+0.95，σ（H_0r）=837 km/s。星系的奇异速度也与\ro =0.56-0.59和σ（V_pec）=610 km/s相关。我们发现，在H_0r~5700 km/s的典型尺度上，2 MFGC和SFI++星系的整体运动可以用振幅V=297+/-23 km/s的偶极子解来表示，其方向指向l=292+/-4 °，b=-12+/-3 °，对TF关系的不同修改仅略微敏感。
英文摘要：
We compare infrared Tully-Fisher (TF) distances and peculiar velocities derived for spiral galaxies from the two largest datasets: the 2MASS selected Flat Galaxy Catalog, 2MFGC [19, 20] and the Arecibo General Catalog with I-band photometry, SFI++ [30,7]. These samples contain peculiar velocities for ~3000 and ~4000 objects, respectively. Based on a sub-sample of ~1000 common deeply inclined galaxies, we reach the following conclusions. Irrespective to high (SFI++) or low (2MFGC) quality of the used photometric data, about 10% of the galaxies in both samples deviate considerably from the main body of the TF relation. After their deletion, the standard TF scatters drops to 0.47^m (2MFGC) and 0.40^m (SFI++). The TF distances, derived from two the samples, demonstrate a high degree of mutual agreement with a correlation coefficient \ro=+0.95 and σ(H_0r)=837 km/s. Peculiar velocities of the galaxies are also correlated with \ro=0.56-0.59 and σ(V_pec)=610 km/s. We find that the bulk motion of the 2MFGC and SFI++ galaxies on a typical scale of H_0r~5700 km/s can be represented by a dipole solution with the amplitude V=297+/-23 km/s directed towards l=292+/-4 degr., b=-12+/-3 degr., being only slightly sensitive to different modifications of the TF relaton.
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