| Full text | |
| Author(s): |
Monteiro-Oliveira, R.
[1]
;
Doubrawa, L.
[1, 2]
;
Machado, R. E. G.
[2]
;
Lima Neto, G. B.
[1]
;
Castejon, M.
[1]
;
Cypriano, E. S.
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, Dept Astron, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo - Brazil
[2] Univ Tecnol Fed Parana, Rua Sete Setembro 3165, BR-80230901 Curitiba, Parana - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 495, n. 2, p. 2007-2021, JUN 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
The galaxy cluster Abell 1644 ((z) over bar = 0.047) is known for its remarkable spiral-like X-ray emission. It was previously identified as a bimodal system, comprising the subclusters, A1644S and A1644N, each one centred on a giant elliptical galaxy. In this work, we present a comprehensive study of this system, including new weak lensing and dynamical data and analysis plus a tailor-made hydrodynamical simulation. The lensing and galaxy density maps showed a structure in the North that could not be seen on the X-ray images. We, therefore, rename the previously known northern halo as A1644N1 and the new one as A1644N2. Our lensing data suggest that those have fairly similar masses: M-200(N1) = 0.90(-0.85)(+0.45) x 10(14) and M-200(N2) = 0.76(-0.75)(+0.37) x 10(14) M-circle dot, whereas the southern structure is the main one: M-200(S) = 1.90(-1.28)(+0.89) x 10(14) M-circle dot. Based on the simulations, fed by the observational data, we propose a scenario where the remarkable X-ray characteristics in the system are the result of a collision between A1644S and A1644N2 that happened similar to 1.6 Gyr ago. Currently, those systems should be heading to a new encounter, after reaching their maximum separation. (AU) | |
| 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: | 18/17543-0 - Astrophysics of groups and clusters of galaxies: observations and simulations |
| Grantee: | Gastão Cesar Bierrenbach Lima Neto |
| Support Opportunities: | Regular Research Grants |