| Full text | |
| Author(s): |
Monteiro-Oliveira, R.
;
Cypriano, E. S.
;
Machado, R. E. G.
;
Lima Neto, G. B.
;
Ribeiro, A. L. B.
;
Sodre, Jr., L.
;
Dupke, R.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 466, n. 3, p. 2614-2632, APR 2017. |
| Web of Science Citations: | 16 |
| Abstract | |
We present a weak-lensing and dynamical study of the complex cluster Abell 1758 (A1758, -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 WA1758NE, with lensing determined masses of 7.90(-1.55)(+1.89) x 10(14) M-circle dot and 5.49(-1.33)(+1.67) x 10(14) M-circle dot, 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: sigma/m < 5.83 cm(2) g(-1). Combining our velocity data with hydrodynamical simulations, we have shown that A1758 NW and NE had their closest approach 0.27 Gyr ago and their merger axis is 21 degrees.+12 degrees. from the plane of the sky. In the A1758S system, we have measured a total mass of 4.96(-1.19)(+1.08) x 10(14) M-circle dot and, using radial velocity data, we found that the main merger axis is located at 70 degrees +/- 4 degrees. from the plane of the sky, therefore closest to the line of sight. (AU) | |
| FAPESP's process: | 10/12277-9 - Numerical simulations of galaxy cluster mergers |
| Grantee: | Rubens Eduardo Garcia Machado |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 12/00800-4 - The 3-D universe: astrophysics with large galaxy surveys |
| Grantee: | Laerte Sodré Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center |
| Grantee: | Elisabete Maria de Gouveia Dal Pino |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 14/13723-3 - Galaxy clusters as portals to the dark universe |
| Grantee: | Eduardo Serra Cypriano |
| Support Opportunities: | Regular Research Grants |