CLASH-VLT: DISSECTING THE FRONTIER FIELDS GALAXY CLUSTER MACS J0416.1-2403 WITH ∼800 SPECTRA OF MEMBER GALAXIES-猫眼课题宝

DOI：

10.3847/0067-0049/224/2/33

发表时间：

2015-11

期刊：

The Astrophysical Journal Supplement Series

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

I. Balestra;A. Mercurio;B. Sartoris;M. Girardi;C. Grillo;M. Nonino;P. Rosati;A. Biviano;S. Ettori;W. Forman;C. Jones;A. Koekemoer;E. Medezinski;J. Merten;G. Ogrean;P. Tozzi;K. Umetsu;E. Vanzella;R. V. Weeren;A. Zitrin;M. Annunziatella;G. Caminha;T. Broadhurst;D. Coe;M. Donahue;A. Fritz;B. Frye;D. Kelson;M. Lombardi;C. Maier;M. Meneghetti;A. Monna;M. Postman;M. Scodeggio;S. Seitz;B. Ziegler

本文介绍了前沿场星系团MACS J0416.1-2403（z = 0.397）的VIMOS-甚大望远镜（VLT）光谱。作为CLASH-VLT巡天的一部分，大型光谱活动提供了超过4000个可靠的红移，超过6000弧分2，包括6000个星系团成员星系。在这个红移的星系团成员的前所未有的样本，使我们能够执行一个非常详细的动力学和结构分析的集群到102.2 r200（104 Mpc）。我们对子结构的分析揭示了一个复杂的系统，（M200 <$0.9 × 1015 M和σV，r200 <$1000 km s−1），具有两个主要特征：（i）双峰速度分布，显示两个中心峰，相隔ΔVrf <$1100 km s−1，具有可比的星系含量和速度色散，以及（ii）主要子结构沿NE-SW方向沿着的突出伸长，其中一个突出的子丛距中心SW约600 kpc，一个孤立的BCG位于中心和SW丛之间的大约一半处。我们还探测到一个低质量结构，位于星团中心以南10′处，z = 0.390，投影值为103 Mpc，相对视速度为ΔVrf −1700 km s−1。我们通过动力学分析得到的团簇质量分布明显偏离“通用”NFW，最适合软化等温球模型。从星系动力学测量的质量分布被发现是在相对较好的协议与那些从强和弱透镜，以及与从X射线，尽管明显的不放松的性质的集群。我们的研究结果揭示了这个大规模集群的整体复杂的动力学状态，并支持这两个主要的子集群被观察到在碰撞前阶段的假设，与最近的研究结果从无线电和深X射线数据。在这篇文章中，我们还发布了这个星团中4386个源的全部红移目录，其中包括60个已识别的钱德拉X射线源和105个JVLA射电源。

We present VIMOS-Very Large Telescope (VLT) spectroscopy of the Frontier Fields cluster MACS J0416.1-2403 (z = 0.397). Taken as part of the CLASH-VLT survey, the large spectroscopic campaign provided more than 4000 reliable redshifts over ∼600 arcmin2, including ∼800 cluster member galaxies. The unprecedented sample of cluster members at this redshift allows us to perform a highly detailed dynamical and structural analysis of the cluster out to ∼2.2 r200 (∼4 Mpc). Our analysis of substructures reveals a complex system composed of a main massive cluster (M200 ∼ 0.9 × 1015 M⊙ and σV,r200 ∼ 1000 km s−1) presenting two major features: (i) a bimodal velocity distribution, showing two central peaks separated by ΔVrf ∼ 1100 km s−1 with comparable galaxy content and velocity dispersion, and (ii) a projected elongation of the main substructures along the NE–SW direction, with a prominent sub-clump ∼600 kpc SW of the center and an isolated BCG approximately halfway between the center and the SW clump. We also detect a low-mass structure at z ∼ 0.390, ∼10′ south of the cluster center, projected at ∼3 Mpc, with a relative line-of-sight velocity of ΔVrf ∼ −1700 km s−1. The cluster mass profile that we obtain through our dynamical analysis deviates significantly from the “universal” NFW, being best fit by a Softened Isothermal Sphere model instead. The mass profile measured from the galaxy dynamics is found to be in relatively good agreement with those obtained from strong and weak lensing, as well as with that from the X-rays, despite the clearly unrelaxed nature of the cluster. Our results reveal an overall complex dynamical state of this massive cluster and support the hypothesis that the two main subclusters are being observed in a pre-collisional phase, in agreement with recent findings from radio and deep X-ray data. In this article, we also release the entire redshift catalog of 4386 sources in the field of this cluster, which includes 60 identified Chandra X-ray sources and 105 JVLA radio sources.

CLASH-VLT: DISSECTING THE FRONTIER FIELDS GALAXY CLUSTER MACS J0416.1-2403 WITH ∼800 SPECTRA OF MEMBER GALAXIES

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