2016ApJ...817...24M -
Astrophys. J., 817, 24 (2016/January-3)
Frontier Fields: Subaru weak-lensing analysis of the merging galaxy cluster A2744.
MEDEZINSKI E., UMETSU K., OKABE N., NONINO M., MOLNAR S., MASSEY R., DUPKE R. and MERTEN J.
Abstract (from CDS):
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 M200c = (2.06 ± 0.42) x 1015M☉ The most massive clump is the southern component with M200c = (7.7 ± 3.4) x 1014 M☉ followed by the western substructure (M200c = (4.5 ± 2.0) x 1014M☉) and two smaller substructures to the northeast ( M200c = (2.8 +/1.6) x 1014 M☉) and northwest ( M200c = (1.9 +/1.2) x 1014 M☉). 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 (87–28+34 arcsec, 90% CL) and the galaxies (7253+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.
Abstract Copyright:
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Journal keyword(s):
cosmology: observations - dark matter - galaxies: clusters: individual: Abell 2744 - gravitational lensing: weak
Nomenclature:
Fig. 5, Table 3: [MUO2016] Core N=1, [MUO2016] WW (Nos NW, NE), [MUO2016] W (No. W).
Simbad objects:
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