Frontier fields: Subaru weak-lensing analysis of the merging galaxy cluster A2744
- Department of Astrophysical Sciences, 4 Ivy Lane, Princeton, NJ 08544 (United States)
- Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan (China)
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
- INAF/Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34143 Trieste (Italy)
- WinSet, Falls Church, 6107E Arlington Blvd., VA 22044 (United States)
- Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE (United Kingdom)
- Observatório Nacional, Rua Gal. Jóse Cristino, 20921-400 Rio de Janeiro (Brazil)
- Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom)
We present a weak-lensing analysis of the merging Frontier Fields (FF) cluster Abell 2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously modeling the two-dimensional reduced shear field using a combination of a Navarro–Frenk–White (NFW) model for the main core and truncated NFW models for the subhalos, we determine their masses and locations. The total mass of the system is constrained as M{sub 200c}=(2.06±0.42)×10{sup 15} M{sub ⊙}. The most massive clump is the southern component with M{sub 200c}=(7.7±3.4)×10{sup 14} M{sub ⊙}, followed by the western substructure (M{sub 200c}=(4.5±2.0)×10{sup 14} M{sub ⊙}) and two smaller substructures to the northeast (M{sub 200c}=(2.8±1.6)×10{sup 14} M{sub ⊙}) and northwest (M{sub 200c}=(1.9±1.2)×10{sup 14} M{sub ⊙}). The presence of the four substructures supports the picture of multiple mergers. Using a composite of hydrodynamical binary simulations we explain this complicated system without the need for a “slingshot” effect to produce the northwest X-ray interloper, as previously proposed. The locations of the substructures appear to be offset from both the gas (87{sub −28}{sup +34} arcsec, 90% CL) and the galaxies (72{sub −53}{sup +34} arcsec, 90% CL) in the case of the northwestern and western subhalos. To confirm or refute these findings, high resolution space-based observations extending beyond the current FF limited coverage to the west and northwestern area are essential.
- OSTI ID:
- 22882296
- Journal Information:
- Astrophysical Journal, Vol. 817, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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