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DOI | 10.1051/0004-6361/201423941 |
Galaxy population properties of the massive X-ray luminous galaxy cluster XDCP J0044.0-2033 at z=1.58 Red-sequence formation, massive galaxy assembly, and central star formation activity | |
Fassbender, R.1,2; Nastasi, A.2,3; Santos, J. S.4,5; Lidman, C.6; Verdugo, M.7; Koyama, Y.8,9; Rosati, P.10,11; Pierini, D.2; Padilla, N.12; Romeo, A. D.13; Menci, N.1; Bongiorno, A.1; Castellano, M.1; Cerulo, P.15; Fontana, A.1; Galametz, A.1; Grazian, A.1; Lamastra, A.1; Pentericci, L.1; Sommariva, V.1; Strazzullo, V.14; Suhada, R.16; Tozzi, P.4 | |
通讯作者 | Fassbender, R. |
来源期刊 | ASTRONOMY & ASTROPHYSICS
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ISSN | 1432-0746 |
出版年 | 2014 |
卷号 | 568 |
英文摘要 | Context. Recent observational progress has enabled the detection of galaxy clusters and groups out to very high redshifts and for the first time allows detailed studies of galaxy population properties in these densest environments in what was formerly known as the "redshift desert" at z> 1.5. Aims. We aim to investigate various galaxy population properties of the massive X-ray luminous galaxy cluster XDCPJ0044.0-2033 at z = 1.58, which constitutes the most extreme currently known matter-density peak at this redshift. Methods. We analyzed deep VLT/HAWK-I near-infrared data with an image quality of 0.5 ’’ and limiting Vega magnitudes (50% completeness) of 24.2 in J- and 22.8 in the Ks band, complemented by similarly deep Subaru imaging in i and V, Spitzer observations at 4.5 mu m, and new spectroscopic observations with VLT/FORS 2. Results. We detect a cluster-associated excess population of about 90 galaxies, most of them located within the inner 30 ’’ (250 kpc) of the X-ray centroid, which follows a centrally peaked, compact NFW galaxy surface-density profile with a concentration of c(200) similar or equal to 10. Based on the Spitzer 4.5 mu m imaging data, we measure a total enclosed stellar mass of M*(500) similar or equal to (6.3 +/- 1.6) x 10(12) M-circle dot and a resulting stellar mass fraction of f(*, 500) = M-*,M- 500/M-500 = (3.3 +/- 1.4)%, consistent with local values. The total J- and Ks-band galaxy luminosity functions of the core region yield characteristic magnitudes J* and Ks* consistent with expectations from simple z(f) = 3 burst models. However, a detailed look at the morphologies and color distributions of the spectroscopically confirmed members reveals that the most massive galaxies are undergoing a very active mass-assembly epoch through merging processes. Consequently, the bright end of the cluster red sequence is not in place, while a red-locus population is present at intermediate magnitudes [Ks*, Ks* + 1.6], which is then sharply truncated at magnitudes fainter than Ks* + 1.6. The dominant cluster-core population comprises post-quenched galaxies transitioning toward the red sequence at intermediate magnitudes, while additionally a significant blue-cloud population of faint star-forming galaxies is present even in the densest central regions. Based on a color-color selection performed to separate different cluster galaxy types, we find that the blue star-forming population is concentrated in clumpy structures and dominates in particular at and beyond the R-500 radius. On the other hand, the fraction of post-starburst galaxies steadily increases toward the center, while the red-locus population and red-sequence transition galaxies seem to reach their peak fractions already at intermediate cluster-centric radii of about r similar to 200 kpc. Conclusions. Our observations support the scenario in which the dominant effect of the dense z similar or equal to 1.6 cluster environment is an accelerated mass-assembly timescale (similar to 1 Gyr or shorter) through merging activity that is responsible for driving core galaxies across the mass-quenching threshold of log(M-*/M-circle dot) similar or equal to 10.4. Beyond this mass limit, star formation is suppressed on timescales of similar to 1 Gyr, while the direct environmental quenching process seems to be subdominant and is acting on significantly longer timescales (similar to 2-3 Gyr). |
英文关键词 | X-rays: galaxies: clusters galaxies: clusters: individual: XDCP J0044.0-2033 galaxies: elliptical and lenticular cD galaxies: evolution galaxies: formation galaxies: luminosity function mass function |
类型 | Article |
语种 | 英语 |
国家 | Italy ; Germany ; France ; Spain ; Australia ; Austria ; England ; Japan ; Chile |
收录类别 | SCI-E |
WOS记录号 | WOS:000341185900084 |
WOS关键词 | COLOR-MAGNITUDE RELATION ; STAR-FORMATION HISTORIES ; SUBARU DEEP SURVEY ; SIMILAR-TO 1.5 ; RED SEQUENCE ; HIGH-REDSHIFT ; STELLAR MASS ; DISTANT CLUSTER ; XMMXCS J2215.9-1738 ; RADIAL-DISTRIBUTION |
WOS类目 | Astronomy & Astrophysics |
WOS研究方向 | Astronomy & Astrophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/180888 |
作者单位 | 1.INAF Osservatorio Astron Roma OAR, Via Frascati 33, I-00040 Monte Porzio Catone, Italy; 2.Max Planck Inst Extraterr Phys MPE, D-85741 Garching, Germany; 3.Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France; 4.INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy; 5.European Space Astron Ctr, Madrid, Spain; 6.Australian Astron Observ, N Ryde, NSW 1670, Australia; 7.Univ Vienna, Dept Astron, A-1180 Vienna, Austria; 8.Univ Durham, Dept Phys, Durham DH1 3LE, England; 9.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan; 10.Univ Ferrara, I-44121 Ferrara, Italy; 11.European So Observ, D-85748 Garching, Germany; 12.Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago 22, Chile; 13.INAF Osservatorio Astrofis, I-95123 Catania, Italy; 14.CEA Saclay, F-91191 Gif Sur Yvette, France; 15.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia; 16.Univ Munich, Dept Phys, D-81679 Munich, Germany |
推荐引用方式 GB/T 7714 | Fassbender, R.,Nastasi, A.,Santos, J. S.,et al. Galaxy population properties of the massive X-ray luminous galaxy cluster XDCP J0044.0-2033 at z=1.58 Red-sequence formation, massive galaxy assembly, and central star formation activity[J],2014,568. |
APA | Fassbender, R..,Nastasi, A..,Santos, J. S..,Lidman, C..,Verdugo, M..,...&Tozzi, P..(2014).Galaxy population properties of the massive X-ray luminous galaxy cluster XDCP J0044.0-2033 at z=1.58 Red-sequence formation, massive galaxy assembly, and central star formation activity.ASTRONOMY & ASTROPHYSICS,568. |
MLA | Fassbender, R.,et al."Galaxy population properties of the massive X-ray luminous galaxy cluster XDCP J0044.0-2033 at z=1.58 Red-sequence formation, massive galaxy assembly, and central star formation activity".ASTRONOMY & ASTROPHYSICS 568(2014). |
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