DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z?=?2.506

doi:10.3847/0004-637X/828/1/56

	DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z?=?2.506
	Wang,Tao 1,2; Elbaz,David 1; Daddi,Emanuele 1; Finoguenov,Alexis 3; Liu,Daizhong 4; Schreiber,Corentin 5; Martín,Sergio 6,7,8; Strazzullo,Veronica 9; Valentino,Francesco 1; Burg,Remco van der 1
刊名	The Astrophysical Journal
	2016-08-30
卷号	828 期号:1
关键词	galaxies: clusters: general galaxies: evolution galaxies: formation galaxies: high-redshift galaxies: starburst large-scale structure of universe
ISSN号	0004-637X
DOI	10.3847/0004-637X/828/1/56
英文摘要	ABSTRACT We report the discovery of a remarkable concentration of massive galaxies with extended X-ray emission at zspec?=?2.506, which contains 11 massive (M* ? 1011 M⊙) galaxies in the central 80 kpc region (11.6σ overdensity). We have spectroscopically confirmed 17 member galaxies with 11 from CO and the remaining ones from Hα. The X-ray luminosity, stellar mass content, and velocity dispersion all point to a collapsed, cluster-sized dark matter halo with mass M200c?=?1013.9±0.2 M⊙, making it the most distant X-ray-detected cluster known to date. Unlike other clusters discovered so far, this structure is dominated by star-forming galaxies (SFGs) in the core with only 2?out of the 11 massive galaxies classified as quiescent. The star formation rate (SFR) in the 80 kpc core reaches ～3400 M⊙ yr?1 with a?gas depletion time of ～200 Myr, suggesting that we caught this cluster in rapid build-up of a dense core. The high SFR is driven by both a high abundance of SFGs and a higher starburst fraction (～25%, compared to 3%–5% in the field). The presence of both a collapsed, cluster-sized halo and a predominant population of massive SFGs suggests that this structure could represent an important transition phase between protoclusters and mature clusters. It provides evidence that the main phase of massive galaxy passivization will take place after galaxies accrete onto the cluster, providing new insights into massive cluster formation at early epochs. The large integrated stellar mass at such high redshift challenges our understanding of massive cluster formation.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-828-1-56
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/23742]
专题	中国科学院紫金山天文台
作者单位	1.Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu, CNRS, Université Paris Diderot, Saclay, pt courrier 131, F-91191 Gif-sur-Yvette, France; tao.wang@cea.fr 2.Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, School of Astronomy and Space Sciences, Nanjing University, Nanjing, 210093, China 3.Department of Physics, University of Helsinki, Gustaf H?¤llstr??min katu 2a, FI-0014 Helsinki, Finland 4.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008, China 5.Leiden Observatory, Leiden University, NL-2300 RA Leiden, The Netherlands 6.European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile 7.Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile 8.Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, Dom. Univ., F-38406, St. Martin d’Hères, France 9.Department of Physics, Ludwig-Maximilians-Universit?t, Scheinerstr. 1, D-81679 München, Germany 10.10School of Physics, Korea Institute for Advanced Study, Hoegiro 85, Dongdaemun-gu, Seoul 130-722, Korea
推荐引用方式 GB/T 7714	Wang,Tao,Elbaz,David,Daddi,Emanuele,et al. DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z?=?2.506[J]. The Astrophysical Journal,2016,828(1).
APA	Wang,Tao.,Elbaz,David.,Daddi,Emanuele.,Finoguenov,Alexis.,Liu,Daizhong.,...&Li,Yanxia.(2016).DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z?=?2.506.The Astrophysical Journal,828(1).
MLA	Wang,Tao,et al."DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z?=?2.506".The Astrophysical Journal 828.1(2016).