Wang,Tao1,2; Elbaz,David1; Daddi,Emanuele1; Finoguenov,Alexis3; Liu,Daizhong4; Schreiber,Corentin5; Martín,Sergio6,7,8; Strazzullo,Veronica9; Valentino,Francesco1; Burg,Remco van der1; Zanella,Anita1; Ciesla,Laure1; Gobat,Raphael10; Brun,Amandine Le1; Pannella,Maurilio9; Sargent,Mark11; Shu,Xinwen12; Tan,Qinghua4; Cappelluti,Nico13; Li,Yanxia14
Source PublicationThe Astrophysical Journal
AbstractABSTRACT 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.
Keywordgalaxies: clusters: general galaxies: evolution galaxies: formation galaxies: high-redshift galaxies: starburst large-scale structure of universe
WOS IDIOP:0004-637X-828-1-56
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu, CNRS, Université Paris Diderot, Saclay, pt courrier 131, F-91191 Gif-sur-Yvette, France;
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
11.11Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, UK
12.12Department of Physics, Anhui Normal University, Wuhu, Anhui, 241000, China
13.13Department of Astronomy, Yale University, New Haven, CT 06511, USA
14.14Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
Recommended Citation
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).
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