论文标题
超湿星系在遥远的大型星系簇中的性质：哈勃边境领域的Abell 370
The Nature of Ultra-diffuse Galaxies in Distant Massive Galaxy Clusters: Abell 370 in the Hubble Frontier Fields
论文作者
论文摘要
我们报告了Abell 370（$ Z = 0.375 $）的超湿星系（UDGS）的发现。我们从哈勃前沿场（HFF）的图像中发现了Abell 370中的46个UDG。大多数UDG是低亮度红色序列星系，而其中一些是蓝色的UDG。我们估计Abell 370，$ n（\ rm UDG）= 644 \ pm104 $中的UDGS的丰度。将这些结果与Abell S1063（$ Z = 0.348 $）和Abell 2744（$ Z = 0.308 $）\ Citep {Lee17}相结合，我们得出了三个簇中UDG的平均径向数密度谱。 UDG和明亮星系的数量密度曲线在集群的中央区域显示出差异：UDGS的轮廓显示出扁平化的变化，因为簇距离降低，而明亮星系的距离显示出持续的增加。这意味着在集群的中央区域中，UDG容易破坏。一个索引近一个：$ n（{\ rm udg}）\ propto m_ {200}^{0.99 \ pm0.05} $ of $ n（{\ rm udg}）\ for $ m_ {200}^for $ m_ {200}> 10^{13} {13}} $ {我们使用基本的歧管方法估算了UDG的大约动态质量，并发现大多数UDG具有类似矮的质量$（M_ {200} <10} <10^{11}} $ $ M _ {\ odot}）$。这意味着大多数UDG具有类似矮的原点，其中少数可能会失败$ l^{*} $ galaxies。这些结果表明，多个起源可能有助于大型星系簇中UDG的形成和演化。
We report the discovery of ultra-diffuse galaxies (UDGs) in Abell 370 ($z=0.375$). We find 46 UDGs in Abell 370 from the images of the Hubble Frontier Fields (HFF). Most UDGs are low-luminosity red sequence galaxies, while a few of them are blue UDGs. We estimate the abundance of UDGs in Abell 370, $N(\rm UDG)=644\pm104$. Combining these results with those of Abell S1063 ($z=0.348$) and Abell 2744 ($z=0.308$) \citep{Lee17}, we derive a mean radial number density profile of UDGs in the three clusters. The number density profiles of UDGs and bright galaxies show a discrepancy in the central region of the clusters: the profile of UDGs shows a flattening as clustercentric distance decreases, while that of bright galaxies shows a continuous increase. This implies that UDGs are prone to disruption in the central region of the clusters. The relation between the abundance of UDGs and virial masses of their host systems is described by a power-law with an index nearly one: $N({\rm UDG})\propto M_{200}^{0.99\pm0.05}$ for $M_{200}>10^{13}~M_{\odot}$. We estimate approximately dynamical masses of UDGs using the fundamental manifold method, and find that most UDGs have dwarf-like masses $(M_{200}<10^{11}$ $M_{\odot})$. This implies that most UDGs have a dwarf-like origin and a small number of them could be failed $L^{*}$ galaxies. These results suggest that multiple origins may contribute to the formation and evolution of UDGs in massive galaxy clusters.
