| Texto completo | |
| Autor(es): |
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]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 495, n. 2, p. 2007-2021, JUN 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL |
| Beneficiário: | Elisabete Maria de Gouveia Dal Pino |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |
| Processo FAPESP: | 18/17543-0 - Astrofísica de grupos e aglomerados de galáxias: observações e simulações |
| Beneficiário: | Gastão Cesar Bierrenbach Lima Neto |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |