狮子/巨蟹星座的大尺度结构和星系运动
Large-scale structure and galaxy motions in the Leo/Cancer constellations
摘要：
在从室女座星系室女星系团到本超星系团南极的RA $=7.0^h...12.0^h$，Dec $=0^\circ...+20^\circ$坐标范围内，我们研究了径向速度为$V_{LG}\lesssim 2000$ km/s的星系的数据。对于其中的290个，我们确定了它们各自的距离和特有的速度。在这个区域，被称为本地速度异常区，有23组和20对星系的维里/轨道质量的估计获得。NGC 3379 = Leo I和NGC 3627附近的一个群以及本星系群显示了从本星系团的空洞向Leo云方向的运动，其特征速度约为400 km/s。NGC 3607周围的另一个丰富的星系群显示出与宇宙背景辐射有关的参考系中约-420 km/s的奇特速度。双子座矮星系群是一个距离为8 Mpc的奇特的散射星协，其径向速度色散仅为20 km/s，大小约为0.7Mpc。它的维里质量估计是恒星总质量的300倍。Leo/Can区星系群和星系对的维里质量之和与其所含星系的恒星质量之和之比等于26，相当于局部平均密度$Ω_{m(local)} = 0.074$，比全球平均物质密度小3-4倍。
英文摘要：
In the region of the sky limited by the coordinates RA$=7.0^h...12.0^h$, Dec$=0^\circ...+20^\circ$ and extending from the Virgo Cluster to the South Pole of the Local Supercluster, we consider the data on the galaxies with radial velocities $V_{LG}\lesssim 2000$ km/s. For 290 among them, we determine individual distances and peculiar velocities. In this region, known as the local velocity anomaly zone, there are 23 groups and 20 pairs of galaxies for which the estimates of virial/orbital masses are obtained. A nearby group around NGC3379 = Leo I and NGC3627 as well as the Local Group show the motion from the Local Void in the direction of Leo cloud with a characteristic velocity of about 400 km/s. Another rich group of galaxies around NGC3607 reveals peculiar velocity of about -420 km/s in the frame of reference related with the cosmic background radiation. A peculiar scattered association of dwarf galaxies Gemini Flock at a distance of 8 Mpc has the radial velocity dispersion of only 20 km/s and the size of approximately 0.7 Mpc. The virial mass estimate for it is 300 times greater than the total stellar mass. The ratio of the sum of virial masses of groups and pairs in the Leo/Can region to the sum of stellar masses of the galaxies contained in them equals 26, which is equivalent to the local average density $Ω_{m(local)} = 0.074$, which is 3-4 times smaller than the global average density of matter.
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