Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane
Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane
复制标题
后发星系团中矮星系的速度色散测量——对基本平面结构的影响
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
B. Poggianti
中科院分区：
文献类型：
--
作者：
A. Cody;D. Carter;T. Bridges;B. Mobasher;B. Poggianti
我们提供后发座星系团中一组矮星系和巨星系的中分辨率光谱数据，其中-20.6 <M R <-15.7。较亮星系的光度学和运动学性质可以用参数来描述，这些参数相对于一组称为基本平面的标度关系几乎没有散射。为了确定这些基本的标度关系在较低的光度的形式，我们测量了一个样本，包括69个星系的边界上的矮和巨制度的速度色散。结合我们的光度测量数据，我们发现光度和速度色散的紧密相关性，L <$σ 2.0，大大平坦的Faber-Jackson关系表征巨大的椭圆星系。此外，在我们的矮样品中，质光比（M/L）随速度色散的变化相当微弱：M/L <$σ 0.2。我们的总体结果与
We present intermediate-resolution spectroscopic data for a set of dwarf and giant galaxies in the Coma cluster, with −20.6 <M R < −15.7. The photometric and kinematic properties of the brighter galaxies can be cast in terms of parameters which present little scatter with respect to a set of scaling relations known as the fundamental plane. To determine the form of these fundamental scaling relations at lower luminosities, we have measured velocity dispersions for a sample comprising 69 galaxies on the border of the dwarf and giant regime. Combining these data with our photometric survey, we find a tight correlation of luminosity and velocity dispersion, L ∝ σ 2.0 , substantially flatter than the Faber–Jackson relation characterizing giant elliptical galaxies. In addition, the variation of mass-to-light (M/L) ratio with velocity dispersion is quite weak in our dwarf sample: M/L ∝ σ 0.2 . Our overall results are consistent with