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Title:
Mass and Hot Baryons in Massive Galaxy Clusters from Subaru Weak-Lensing and AMiBA Sunyaev-Zel'Dovich Effect Observations
Authors:
Umetsu, Keiichi; Birkinshaw, Mark; Liu, Guo-Chin; Wu, Jiun-Huei Proty; Medezinski, Elinor; Broadhurst, Tom; Lemze, Doron; Zitrin, Adi; Ho, Paul T. P.; Huang, Chih-Wei Locutus; Koch, Patrick M.; Liao, Yu-Wei; Lin, Kai-Yang; Molnar, Sandor M.; Nishioka, Hiroaki; Wang, Fu-Cheng; Altamirano, Pablo; Chang, Chia-Hao; Chang, Shu-Hao; Chang, Su-Wei; Chen, Ming-Tang; Han, Chih-Chiang; Huang, Yau-De; Hwang, Yuh-Jing; Jiang, Homin; Kesteven, Michael; Kubo, Derek Y.; Li, Chao-Te; Martin-Cocher, Pierre; Oshiro, Peter; Raffin, Philippe; Wei, Tashun; Wilson, Warwick
Affiliation:
AA(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ; Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan ), AB(Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK ), AC(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ; Department of Physics, Tamkang University, 251-37 Tamsui, Taipei County, Taiwan ), AD(Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan ; Department of Physics, National Taiwan University, Taipei 10617, Taiwan ), AE(School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel ), AF(School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel ), AG(School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel ), AH(School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel ), AI(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AJ(Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan ; Department of Physics, National Taiwan University, Taipei 10617, Taiwan ), AK(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AL(Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan ; Department of Physics, National Taiwan University, Taipei 10617, Taiwan ), AM(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ; Department of Physics, National Taiwan University, Taipei 10617, Taiwan ), AN(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AO(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AP(Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan ; Department of Physics, National Taiwan University, Taipei 10617, Taiwan ), AQ(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AR(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AS(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AT(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AU(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AV(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AW(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AX(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AY(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AZ(Australia Telescope National Facility, P.O. Box 76, Epping NSW 1710, Australia), BA(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), BB(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), BC(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), BD(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), BE(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), BF(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), BG(Australia Telescope National Facility, P.O. Box 76, Epping NSW 1710, Australia)
Publication:
The Astrophysical Journal, Volume 694, Issue 2, pp. 1643-1663 (2009). (ApJ Homepage)
Publication Date:
04/2009
Origin:
IOP
ApJ Keywords:
cosmic microwave background, cosmology: observations, galaxies: clusters: individual: A1689 A2142 A2261 A2390, gravitational lensing
DOI:
10.1088/0004-637X/694/2/1643
Bibliographic Code:
2009ApJ...694.1643U

Abstract

We present a multiwavelength analysis of a sample of four hot (TX > 8 keV) X-ray galaxy clusters (A1689, A2261, A2142, and A2390) using joint AMiBA Sunyaev-Zel'dovich effect (SZE) and Subaru weak-lensing observations, combined with published X-ray temperatures, to examine the distribution of mass and the intracluster medium (ICM) in massive cluster environments. Our observations show that A2261 is very similar to A1689 in terms of lensing properties. Many tangential arcs are visible around A2261, with an effective Einstein radius ~40'' (at z ~ 1.5), which when combined with our weak-lensing measurements implies a mass profile well fitted by a Navarro-Frenk-White model with a high concentration c vir ~ 10, similar to A1689 and to other massive clusters. The cluster A2142 shows complex mass substructure, and displays a shallower profile (c vir ~ 5), consistent with detailed X-ray observations which imply recent interaction. The AMiBA map of A2142 exhibits an SZE feature associated with mass substructure lying ahead of the sharp northwest edge of the X-ray core suggesting a pressure increase in the ICM. For A2390 we obtain highly elliptical mass and ICM distributions at all radii, consistent with other X-ray and strong-lensing work. Our cluster gas fraction measurements, free from the hydrostatic equilibrium assumption, are overall in good agreement with published X-ray and SZE observations, with the sample-averaged gas fraction of langf gas(<r 200)rang = 0.133 ± 0.027, for our sample with langM virrang = (1.2 ± 0.1) × 1015 M sun h -1. When compared to the cosmic baryon fraction fb = Ω b m constrained by the WMAP five-year data, this indicates langf gas,200rang/fb = 0.78 ± 0.16, i.e., (22 ± 16)% of the baryons are missing from the hot phase of clusters.

Based in part on data collected at the Subaru Telescope, which is operated by the National Astronomical Society of Japan.


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