Three-dimensional multi-probe analysis of the galaxy cluster A1689

Journal Article · Sat Jun 20 04:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/806/2/207· OSTI ID:22883025

Umetsu, Keiichi ^[1]; Sereno, Mauro ^[2]; Medezinski, Elinor ^[3]; Nonino, Mario ^[4]; Mroczkowski, Tony ^[5]; Diego, Jose M. ^[6]; Ettori, Stefano ^[7]; Okabe, Nobuhiro ^[8]; Broadhurst, Tom ^[9]; Lemze, Doron ^[10]

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1. Institute of Astronomy and Astrophysics, Academia Sinica, P. O. Box 23-141, Taipei 10617, Taiwan (China)
2. Dipartimento di Fisica e Astronomia, Alma Mater Studiorum—Università di Bologna Viale Berti Pichat 6/2, I-40127 Bologna (Italy)
3. The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904 (Israel)
4. INAF-Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34143 Trieste (Italy)
5. National Research Council Fellow at the U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (United States)
6. IFCA, Instituto de Física de Cantabria (UC-CSIC), Av. de Los Castros s/n, 39005 E-Santander (Spain)
7. INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna (Italy)
8. Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
9. Ikerbasque, Basque Foundation for Science, Alameda Urquijo, 36-5 Plaza Bizkaia, E-48011 Bilbao (Spain)
10. Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 (United States)

We perform a three-dimensional multi-probe analysis of the rich galaxy cluster A1689, one of the most powerful known lenses on the sky, by combining improved weak-lensing data from new wide-field BVR{sub C}i′z′ Subaru/Suprime-Cam observations with strong-lensing, X-ray, and Sunyaev–Zel’dovich effect (SZE) data sets. We reconstruct the projected matter distribution from a joint weak-lensing analysis of two-dimensional shear and azimuthally integrated magnification constraints, the combination of which allows us to break the mass-sheet degeneracy. The resulting mass distribution reveals elongation with an axis ratio of ∼0.7 in projection, aligned well with the distributions of cluster galaxies and intracluster gas. When assuming a spherical halo, our full weak-lensing analysis yields a projected halo concentration of c{sub 200c}{sup 2D}=8.9±1.1 (c{sub vir}{sup 2D}∼11), consistent with and improved from earlier weak-lensing work. We find excellent consistency between independent weak and strong lensing in the region of overlap. In a parametric triaxial framework, we constrain the intrinsic structure and geometry of the matter and gas distributions, by combining weak/strong lensing and X-ray/SZE data with minimal geometric assumptions. We show that the data favor a triaxial geometry with minor–major axis ratio 0.39±0.15 and major axis closely aligned with the line of sight (22°±10°). We obtain a halo mass M{sub 200c}=(1.2±0.2)×10{sup 15} M{sub ⊙} h{sup −1} and a halo concentration c{sub 200c}=8.4±1.3, which overlaps with the ≳1σ tail of the predicted distribution. The shape of the gas is rounder than the underlying matter but quite elongated with minor–major axis ratio 0.60 ± 0.14. The gas mass fraction within 0.9 Mpc is 10{sub −2}{sup +3}%, a typical value for high-mass clusters. The thermal gas pressure contributes to ∼60% of the equilibrium pressure, indicating a significant level of non-thermal pressure support. When compared to Planck's hydrostatic mass estimate, our lensing measurements yield a spherical mass ratio of M{sub Planck}/M{sub GL}=0.70±0.15 and 0.58 ± 0.10 with and without corrections for lensing projection effects, respectively.

• OSTI ID: 22883025
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 806; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United Kingdom
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
COSMOLOGY
ELONGATION
GALAXY CLUSTERS
GRAVITATIONAL LENSES
HYDROSTATICS
MASS
MASS DISTRIBUTION
NONLUMINOUS MATTER
TWO-DIMENSIONAL CALCULATIONS