A Redshift Survey of the Nearby Galaxy Cluster Abell 2199: Comparison of the Spatial and Kinematic Distributions of Galaxies with the Intracluster Medium
Hyunmi Song, Ho Seong Hwang, Changbom Park, Takayuki Tamura
We present the results from an extensive spectroscopic survey of the central region of the nearby galaxy cluster Abell 2199 at $z=0.03$. By combining 775 new redshifts from the MMT/Hectospec observations with the data in the literature, we construct a large sample of 1624 galaxies with measured redshifts at $R<30^\prime$, which results in high spectroscopic completeness at $r_{\rm petro,0}<20.5$ (77%). We use these data to study the kinematics and clustering of galaxies focusing on the comparison with those of the intracluster medium (ICM) from Suzaku X-ray observations. We identify 406 member galaxies of A2199 at $R<30^\prime$ using the caustic technique. The velocity dispersion profile of cluster members appears smoothly connected to the stellar velocity dispersion profile of the cD galaxy. The luminosity function is well fitted with a Schechter function at $M_r<-15$. The radial velocities of cluster galaxies generally agree well with those of the ICM, but there are some regions where the velocity difference between the two is about a few hundred kilometer per second. The cluster galaxies show a hint of global rotation at $R<5^\prime$ with $v_{\rm rot}=300{-}600\,\textrm{km s}^{-1}$, but the ICM in the same region do not show such rotation. We apply a friends-of-friends algorithm to the cluster galaxy sample at $R<60^\prime$ and identify 32 group candidates, and examine the spatial correlation between the galaxy groups and X-ray emission. This extensive survey in the central region of A2199 provides an important basis for future studies of interplay among the galaxies, the ICM and the dark matter in the cluster.
Revealing the magnetization of the intracluster medium of Abell 3581 using background Faraday rotation measures from the POSSUM survey
University of Toronto（多伦多大学）；McGill University（麦吉尔大学）；Yonsei University（延世大学）；CSIRO Astronomy and Space Science（澳大利亚联邦科学与工业研究组织天文与航天科学部）；University of California Santa Cruz（加州大学圣克鲁兹分校）；INAF - Istituto di Radioastronomia（意大利国家天体物理研究所射电天文研究所）；The Australian National University（澳大利亚国立大学）；National Astronomical Observatory of Japan（日本国立天文台）；Universidad Complutense de Madrid（马德里康普顿斯大学）；National Research Council Canada（加拿大国家研究委员会）；University of Minnesota（明尼苏达大学）
Weak-lensing Analysis of Intracluster Filaments in Abell 2744: Matched-filter Scans and Stepwise 2D Tracing
Yonsei University（延世大学）；California Institute of Technology（加州理工学院）；University of California, Davis（加州大学戴维斯分校）；INAF–Osservatorio Astronomico di Padova（意大利国家天体物理研究所帕多瓦天文台）
The longest known tails of ram-pressure-stripped star-forming galaxies are caused by an intracluster medium shock in Abell 1367
Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；Hamburger Sternwarte, University of Hamburg（汉堡天文台，汉堡大学）；Thüringer Landessternwarte（图林根州立天文台）；Max-Planck-Institut für Radioastronomie（马克斯·普朗克射电天文研究所）；Center for Astrophysics, Harvard & Smithsonian（哈佛与史密森天体物理中心）；Department of Physics & Astronomy, University of Alabama in Huntsville（阿拉巴马大学亨茨维尔分校物理与天文学系）；INAF - Istituto di Radioastronomia（意大利国家天体物理研究所射电天文部）；INAF - Astronomical Observatory of Padova（意大利国家天体物理研究所帕多瓦天文台）；Waterloo Centre for Astrophysics, University of Waterloo（滑铁卢天体物理中心，滑铁卢大学）
Bulk and turbulent gas motions in the interacting galaxy cluster Abell 3395 South observed with XRISM
Nara Women’s University（奈良女子大学）；Argelander-Institut für Astronomie (AIfA), Universität Bonn（波恩大学阿尔兰德天体物理研究所）；Max-Planck-Institut für Radioastronomie (MPIfR)（马克斯·普朗克射电天文研究所）；INAF - Osservatorio Astronomico di Trieste（的里雅斯特天文台）；IFPU - Institute for Fundamental Physics of the Universe（宇宙基础物理研究所）；Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians-Universität München（慕尼黑大学物理学院大学天文台）
Discovery of a nearby radio relic in the low-mass, merging cluster Abell 4067
University of the Witwatersrand（威特沃特斯兰德大学）；University of Pretoria（比勒陀利亚大学）；SKA Observatory（平方公里阵列射电望远镜天文台）；University of Oxford（牛津大学）；Rhodes University（罗兹大学）；South African Radio Astronomy Observatory（南非射电天文观测站）；Texas A&M University（德克萨斯农工大学）；Chulalongkorn University（朱拉隆功大学）
Weak lensing and spectroscopic analysis of the nearby dissociative merging galaxy cluster Abell 3376
The galaxy cluster Abell~3376 is a nearby (z=0.046) dissociative merging cluster surrounded by two prominent radio relics and showing an X-ray comet-like morphology. The merger system is comprised of the subclusters A3376W & A3376E. Based on new deep multi-wavelength large-field images and published redshifts, we bring new insights about the history of this merger. Despite the difficulty of applying the weak lensing technique at such low redshift, we successfully recovered the mass distribution in the cluster field. Moreover, with the application of a two-body model, we have addressed the dyna…
A Gamma-ray Emitting Head-Tail Radio Galaxy Swimming Through the Hot Medium of the Merging Cluster Abell 3627
Inter-University Centre for Astronomy and Astrophysics (IUCAA)（天文与天体物理大学间中心）；Centre for Space Research, North-West University（西北大学太空研究中心）；International Gemini Observatory/NSF NOIRLab（国际双星观测台/美国国家光学红外天文实验室）；Indian Institute of Astrophysics（印度天体物理研究所）；Universität Bielefeld（比勒费尔德大学）；Assam Don Bosco University（阿萨姆唐博斯科大学）；Dayanand Science College（戴亚南德科学学院）
XRISM Reveals a Kinematically Coherent Core System of the Nearby Cool-Core Cluster Abell 2199
Tokyo University of Science（东京科学大学）；Kyoto Sangyo University（京都产业大学）；University of Alabama in Huntsville（阿拉巴马大学亨茨维尔分校）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；Rikkyo University（立教大学）
The Megaparsec-scale Gas-sloshing Spiral in the Remnant Cool Core Cluster Abell 1763
本文对红移z = 0.231的大质量星系团Abell 1763进行了多波长研究。对19.6 ks钱德拉存档观测的图像分析显示，在团内介质（ICM）中，团簇范围内的螺旋状表面亮度增强。虽然这样的螺旋被理解为形成具有晃动强冷芯（SCC）的簇，但包括螺旋顶点的气体具有中等熵（$\sim$ 110 keV cm $^{2}$）和冷却时间（$\sim$ 6.8 Gyr），表明在整个螺旋形成过程中发生芯破裂。两个由系统中第二和第三等级的星系主导的子星系团沿着一条平行于主星系团ICM的伸长轴的线。这两个子系统似乎都是沿着先前发现的星系团间的灯丝下降的，并且都被认为是负责启动破坏性核心晃动的扰动者的候选者。动力学分析表明，正在发生的相对径向速度为$\sim$ 1800 km s $^{-1}$。Abell 1763星系团中最明亮的星系团具有高的视向速度（v $_{pec}$ $\sim$ 650 km s $^{-1}$），并拥有一个强大的（P $_{1.4}$ $\sim$ 10 $^{26}$ W Hz $^{-1}$）弯曲双叶射电源，可能是由合并中诱导的相对大体积ICM流形成的。SCC破坏的集群合并模型调用低碰撞参量作为核心转换所需的条件。与此相反，在阿贝尔1763年发生的高角动量事件表明，离轴合并在建立非冷核心集群人口比以前假设的发挥更大的作用。
