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首页> 外文期刊>The Astrophysical journal >GALAXY ORBITS FOR GALAXY CLUSTERS IN THE SLOAN DIGITAL SKY SURVEY AND TWO DEGREE FIELD GALAXY REDSHIFT SURVEY
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GALAXY ORBITS FOR GALAXY CLUSTERS IN THE SLOAN DIGITAL SKY SURVEY AND TWO DEGREE FIELD GALAXY REDSHIFT SURVEY

机译：斯隆数字天空调查和两个度数场银河变移调查中银河团的银河轨道

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摘要

We present the results of a study for galaxy orbits in galaxy clusters using a spectroscopic sample of galaxies in SDSS and 2dFGRS. We have determined the member galaxies of Abell clusters covered by these surveys using the galaxies' redshift and positional data. We have selected 10 clusters using three criteria: the number of member galaxies is greater than or equal to 40, the spatial coverage is complete, and the X-ray mass profile is available in the literature. We derive the radial profile of the galaxy number density and velocity dispersion using all, early-type, and late-type galaxies for each cluster. We have investigated the galaxy orbits for our sample clusters with constant and variable velocity anisotropies over the clustercentric distance using the Jeans equation. Using all member galaxies, the galaxy orbits are found to be isotropic within the uncertainty for most of the sample clusters, although it is difficult to conclude strongly for some clusters due to the large errors and the variation as a function of the clustercentric distance in the calculated velocity anisotropies. We investigated the orbital difference between early-type and late-type galaxies for four sample clusters and found no significant difference between them.
机译：我们介绍了使用SDSS和2dFGRS中的星系光谱样本对星系团中的星系轨道进行研究的结果。我们已经使用星系的红移和位置数据确定了这些调查所涵盖的Abell星团的成员星系。我们使用三个标准选择了10个星团：成员星系的数量大于或等于40，空间覆盖范围完整，X射线质量轮廓在文献中可用。我们使用每个星团的所有早期，晚期类型的星系，得出了星系数密度和速度色散的径向分布。我们使用Jeans方程研究了在恒星中心距离上具有恒定和可变速度各向异性的样本集群的星系轨道。使用所有成员星系，发现大多数样本星团的不确定性范围内，银河系轨道是各向同性的，尽管由于较大的误差和随星团中心距离的变化而很难对某些星团做出强有力的结论。计算的速度各向异性。我们研究了四个样本簇的早期类型和晚期类型之间的轨道差异，发现它们之间没有显着差异。

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