Revisiting the original Morphology-Density Relation
Revisiting the original Morphology-Density Relation
复制标题
重新审视最初的形态-密度关系
DOI：
10.1093/mnras/stv1113
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Houghton
中科院分区：
文献类型：
--
作者：
R. Houghton
根据最近的研究结果从运动形态密度关系，我们调查是否存在相同的趋势，在原来的形态密度关系，使用相同的数据Dressler。除了Dressler的正则关系，我们发现，进一步的改进是可能的，当考虑到平均本地投影星系团中的星系密度。首先，椭圆星系在星系团中的分布取决于星系团中星系的相对局部密度：对于平均局部密度较高的星系团，在较高的局部密度下，椭圆部分会出现相等的增加。这与Dressler最初发现的晚型部分不同，晚型部分中星系团局部密度的变化与该星系团中星系的平均局部密度无关，而且，星系团中椭圆星系与早型星系的总体比例不依赖于该星系团中星系的平均密度（与望远镜与磁盘系统的比率不同），并且固定在30%左右。在范例的快速和缓慢的旋转，我们表明，这样的椭圆形的分数在早期类型的人口是一致的慢旋转分数的15%，在早期类型的人口，使用ATLAS 3D调查的统计数据。我们还发现，在椭圆形的整体比例的分散到早期类型是最大的集群具有较低的平均密度，这样的集群具有最高的椭圆分数具有最低的平均局部密度。最后，我们表明，平均局部投影密度与全球投影密度相关，但后者难以准确地描述密度的不规则簇形态。
In light of recent findings from the kinematic morphology-density relation, we investigate whether the same trends exist in the original morphology density relation, using the same data as Dressler. In addition to Dressler's canonical relations, we find that further refinements are possible when considering the average local projected density of galaxies in a cluster. Firstly, the distribution of ellipticals in a cluster depends on the relative local density of galaxies in that cluster: equivalent rises in the elliptical fraction occur at higher local densities for clusters with higher average local densities. This is not true for the late-type fraction, where the variation with local density within a cluster is independent of the average local density of galaxies in that cluster, and is as Dressler originally found. Furthermore, the overall ratio of ellipticals to early-types in a cluster does not depend on the average density of galaxies in that cluster (unlike the ratio of lenticulars to disk systems), and is fixed at around 30%. In the paradigm of fast and slow rotators, we show that such an elliptical fraction in the early-type population is consistent with a slow rotator fraction of 15% in the early-type population, using the statistics of the ATLAS3D survey. We also find the scatter in the overall ratio of ellipticals to early-types is greatest for clusters with lower average densities, such that clusters with the highest elliptical fractions have the lowest average local densities. Finally, we show that average local projected density correlates well with global projected density, but the latter has difficulty in accurately characterising the density of irregular cluster morphologies.
最密集环境中的快速和慢速旋转体：对 A1689 中 z = 0.183 处星系的 FLAMES/GIRAFFE 积分场光谱研究
影响因子：
4.8
作者：
D'Eugenio F
通讯作者：
D'Eugenio F
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.