WEAK-LENSING RESULTS FOR THE MERGING CLUSTER A1758

被引：32

作者：

Ragozzine, B. ^{[1
]}

Clowe, D. ^{[1
]}

Markevitch, M. ^{[2
]}

Gonzalez, A. H. ^{[3
]}

Bradac, M. ^{[4
]}

机构：

[1] Ohio Univ, Dept Phys & Astron, Inst Astrophys, Athens, OH 45701 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 744卷 / 02期

关键词：

dark matter; galaxies: clusters: general; galaxies: clusters: individual (A1758); gravitational lensing: weak; DARK-MATTER; PHOTOMETRIC REDSHIFTS; GALAXY FORMATION; CROSS-SECTION; MASS; BULLET; GRAVITY; CHANDRA; PROOF;

D O I：

10.1088/0004-637X/744/2/94

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：9

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