期刊
ASTROPHYSICAL JOURNAL
卷 744, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/744/2/94
关键词
dark matter; galaxies: clusters: general; galaxies: clusters: individual (A1758); gravitational lensing: weak
资金
- NASA through Space Telescope Science Institute [HST-GO-11194.01-A]
- NASA [NAS 5-26555, 11194]
- Alfred P. Sloan Foundation
Here we present the weak-lensing results for A1758, which is known to consist of four subclusters undergoing two separate mergers, A1758N and A1758S. Weak-lensing results for A1758N agree with previous weak-lensing results for clusters 1E0657-558 (Bullet cluster) and MACS J0025.4-1222, whose X-ray gas components were found to be largely separated from their clusters' gravitational potentials. A1758N has a geometry that is different from previously published mergers in that one of its X-ray peaks overlays the corresponding gravitational potential and the other X-ray peak is well separated from its cluster's gravitational potential. The weak-lensing mass peaks of the two northern clusters are separated at the 2.5 sigma level. We estimate the combined mass of the clusters in A1758N to be (2.2 +/- 0.5) x 10(15) M-circle dot and r(200) = 2300(-130)(+100) kpc. We also detect seven strong-lensing candidates, two of which may provide information that would improve the mass measurements of A1758N.
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