论文标题
对3C129星系群的近红外研究
A near-infrared study of the obscured 3C129 galaxy cluster
论文作者
论文摘要
我们提出了3C129 Galaxy群集的261个新红外成员的目录。该集群位于$ z \ $ 0.02，构成了珀尔修斯 - 策略丝的一部分，由于其位于回避区域的位置，因此在光波长处被遮盖。我们使用ukidss银河飞机调查在一个半径为$ 1.1^{\ circ} $的区域内提供的$ j-$和$ k- $频段成像数据确定了这些星系，以$ 1.1^{\ circ} $为中心，以$ \ ell，b \ ell，b \ ell，b \ ell，b \ f \ circ。共有26个已确定的星系成员已知红移24个来自我们的2016年Westerbork HI调查，其中2个来自光谱。对3C129群集核心的星系密度的分析表明，它比昏迷和Norma群集的密度小，但与Perseus群集核心的星系密度相当。根据对具有红移的3C129聚集星系的空间和速度分布的评估，我们得出了$ cz = 5227 \ pm 171 $ km/s的速度，$ q = 1097 = 1097 \ 1097 \ pm 252 $ 252 $ km/s的主要集群，$ kmtrustrure in $ kmtructure in $ kmtrupture in $ kmstrure in $ kmskipts cluster cluster cluster cluster cluster cluster cluster cluster cluster in $σ= 422 \ pm 100 $ km/s。基于X射线分析，该群集尚未病毒，并且可能已经进行了最近的合并，因此该子结构的存在与以前的主张一致。
We present a catalogue of 261 new infrared selected members of the 3C129 galaxy cluster. The cluster, located at $z \approx$ 0.02, forms part of the Perseus-Pisces filament and is obscured at optical wavelengths due to its location in the zone of avoidance. We identified these galaxies using the $J-$ and $K-$band imaging data provided by the UKIDSS Galactic Plane Survey within an area with a radius of $1.1^{\circ}$ centred on the X-ray emission of the cluster at $\ell, b \approx 160.52^{\circ}, 0.27^{\circ}$. A total of 26 of the identified galaxy members have known redshifts 24 of which are from our 2016 Westerbork HI survey and two are from optical spectroscopy. An analysis of the galaxy density at the core of the 3C129 cluster shows it to be less dense than the Coma and Norma clusters, but comparable to the galaxy density in the core of the Perseus cluster. From an assessment of the spatial and velocity distributions of the 3C129 cluster galaxies that have redshifts, we derived a velocity of $cz = 5227 \pm 171$ km/s and $σ= 1097 \pm 252$ km/s for the main cluster, with a substructure in the cluster outskirts at $cz = 6923 \pm 71$ km/s with $σ= 422 \pm 100$ km/s. The presence of this substructure is consistent with previous claims based on the X-ray analysis that the cluster is not yet virialised and may have undergone a recent merger.
