The merger history of the complex cluster Abell 1758: a combined weak lensing and spectroscopic view

Abstract We present a weak-lensing and dynamical study of the complex cluster Abell 1758 (A1758, $\bar{z} = 0.278$ ) supported by hydrodynamical simulations. This cluster is composed of two main structures called A1758N and A1758S. The northern structure is composed of A1758NW and A1758NE, with lens...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2017-04, Vol.466 (3), p.2614-2632
Hauptverfasser: Monteiro-Oliveira, R., Cypriano, E. S., Machado, R. E. G., Lima Neto, G. B., Ribeiro, A. L. B., Sodré, L., Dupke, R.
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Sprache:eng
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Zusammenfassung:Abstract We present a weak-lensing and dynamical study of the complex cluster Abell 1758 (A1758, $\bar{z} = 0.278$ ) supported by hydrodynamical simulations. This cluster is composed of two main structures called A1758N and A1758S. The northern structure is composed of A1758NW and A1758NE, with lensing determined masses of $7.90_{-1.55}^{+1.89}$  × 1014 M⊙ and $5.49_{-1.33}^{+1.67}$  × 1014 M⊙, respectively. They show a remarkable feature: while in A1758NW, there is a spatial agreement among weak-lensing mass distribution, intracluster medium and its brightest cluster galaxy (BCG), in A1758NE, the X-ray peak is located $96_{-15}^{+14}$  arcsec away from the mass peak and BCG positions. Given the detachment between gas and mass, we could use the local surface mass density to estimate an upper limit for the dark matter self-interaction cross-section: σ/m 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stw3238